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Bayou Surface Drive, LLC
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7,077 Posts
Discussion Starter #1 (Edited)
Here is the FAQ thread for Chevy and GMC applications. It is geared to provide all of us with useful knowlege of your gm pickup. I have the format layed out in alphabetical order for the ease of finding information. The main sections are labled in BOLD print so that it will stand out as you scroll through the topics. Links to certain threads are posted in this particular thread to make your search for a certain topic or modification easier. If you have any input, add a reply and I'll put it in the main post with your ID. Lots on information is from www.pirate4x4.com because of its wealth of information. If there are any questions replied to this topic they will be removed, because this is an informative thread to guide you in the right direction.



General Motors Drive Axle Information (*denotes AAM specific info)

Corporate 10 bolt:
  • ½ ton axle
  • 10 bolts that attach diff cover
  • 8.5"/8.6" ring gear
  • Semi float design with c-clips in rear
  • Full float design up front
  • Uses shims between housing and carrier bearing race
  • Parts readily available
  • 1.25" OD 30 spline inners
  • 19 spline outers (front models only)
Corporate 14 bolt (semi floater):
  • ¾ ton axle or high GVWR ½ ton
  • 14 bolts that attach diff cover
  • 9.5" ring gear
  • Oval shaped housing
  • Semi float design with c-clips
  • Uses shims on side of the carrier & a spanner on the other side
  • 1.375" OD 33 spline inners
  • 1.375" OD 33 spline outers (front models only)*
  • 14SF information thread Credit: Bryan ~ AxisT6

Corporate 14 bolt (full floater):
  • 1 ton and high GVWR ¾ ton rear
  • One of the most desired off-road axles
  • 10.5" ring gear
  • Spanners on both sides of the carrier
  • Diamond shaped housing
  • Full float design
  • Parts readily available
  • Easy to modify and build strong
  • 14FF Bible Credit: BillaVista @ Pirate4x4
  • 14FF Swap Credit: BigRed05
AAM 14 Bolt (full floater)*
  • 1 ton and high GVWR ¾ ton rear
  • 11.5” ring gear
  • 1.5" 30 spline axles
  • Long vertical oval shaped housing
  • Full float design
  • Parts available from Ram & GM dealers
  • Only found in Duramax, 8.1L, & Ram Cummins trucks

Dana Spicer Drive Axle Information

Dana 60
  • Used in 1 ton GM/Dodge/Ford & some high GVWR ¾ ton applications
  • 9.75" ring gear
  • 1.5” OD 35 spine inner axles (GM models)
  • Full float design (all fronts and most rears]
  • Uses shims between carrier bearing & carrier on both sides
  • Pinion depth shim is located behind the inner pinion race, between it and the housing
  • This axle is one of the most desired front drive axles
  • http://www.pirate4x4.com/tech/billavista/60_front/index.html Credit: BillaVista @ Pirate4x4
Dana 44
  • Used in ¾ and ½ ton GM/Dodge/Ford & some low GVWR ¾ ton applications
  • 8.5" ring gear
  • 1.25” OD 30 spine inners (GM models)
  • 19 spline outers
  • Full float design (front applications)
  • Uses shims between carrier bearing & carrier on both sides
  • Pinion depth shim is located behind the inner pinion race, between it and the housing
Miscellaneous Axle articles:
Brakes
Bleeding
----------------------------------------------------
"...This is from the FSM and it works great..."
1. Drivers side rear
2. Passenger side rear
3. Passenger side front
4. Drivers side front
5. LSPV (Load sensing proportioning valve)
----------------------------------------------------

Brakes for SAS
http://gmfullsize.com/forum/showthread.php?t=138311

Disc Brakes on a 14 bolt FF
http://www.off-road.com/trucks4x4/article/articleDetail.jsp?id=200819
http://www.pirate4x4.com/forum/showthread.php?t=511724

14 bolt SF disc
http://www.gmfullsize.com/forum/showthread.php?t=186980
http://www.gmfullsize.com/forum/showthread.php?t=189801


Bumpers
Aftermarket
http://www.gmfullsize.com/forum/showthread.php?t=191009
http://www.gmfullsize.com/forum/showthread.php?t=188306


Cooling Systems -
http://www.pirate4x4.com/tech/billavista/Cooling/

Differentials

Gear Install by AxisT6
http://www.gmfullsize.com/forum/showthread.php?t=190110

Regear Tools and Set Up
http://gmfullsize.com/forum/showthread.php?t=143252

IFS axle disassembly and Regear Information By Country Boy
http://gmfullsize.com/forum/showthread.php?t=145052

Gearing
www.4lo.com
use calculaters to your advantage

Gearing Suggested by tire size.
31 or smaller tire 3.42-3.73
33 inch tire 3.73-4.10
35 to 38 inch tire. 4.56-5.13
39-larger tire. 5.13-5.38

Differential - Shaved, Trussed, and Armored Axle Collection

TOTW 14 bolt Shave
http://www.pirate4x4.com/forum/showthread.php?t=116745

Ck5 14 bolt shave
http://coloradok5.com/shaved14bolt.shtml

Shaving a Dana 60
http://www.4x4wire.com/tech/shaved60/

Driveshaft Tech -

Driveline - How to make a Square Shaft
http://www.pirate4x4.com/forum/showthread.php?t=90517
http://www.pirate4x4.com/tech/billavista/PR-shaft/index.html

Electrical Questions

More than you want to know…….
http://www.autoshop101.com/autoshop15.html


ENGINE / MOTOR SWAP INFO
Common swaps - very general

Cummins into a Chevy
http://coloradok5.com/forums/showthread.php?t=260442

TOTW
http://www.pirate4x4.com/forum/showthread.php?t=127549
http://www.pirate4x4.com/forum/showt...&highlight=427
http://www.pirate4x4.com/forum/showthread.php?t=406649

Cadillac Performance
http://www.pirate4x4.com/forum/showthread.php?t=287860

Flat Towing a Chevy
disconnect rear drive shaft when flat towing. even if case is in neutral, the rear shaft is spinning and parts are moving. The oil pump in the case is driven by the input so if the engine isnt running you can damnge your transfer case.

Fender Trimming Thread -
http://www.pirate4x4.com/forum/showthread.php?t=436124

Leveling Kits and Tire size for NNBS
http://www.gmfullsize.com/forum/showthread.php?t=169098
http://www.gmfullsize.com/forum/showthread.php?t=215010


LIFT KITS

IFS lift install

Cajun4x4 OBS 6" lift
http://www.gmfullsize.com/forum/showthread.php?t=45426

HoveyBayou Nbs 6" lift install
http://www.gmfullsize.com/forum/showthread.php?t=72016

Lockers
Whats Better?

Limited Slip differentials
Good for street driven and mildly offroad rigs.

Lockers
great for 100% traction in offorad, not so street freindly, still allows for differentiation in turns, but tires are always going the drive speed not slower like in LSD's or open diffs.

Open allows the wheel with the least amount of resistance to receive the most torque

NNBS/ GMT-900 tech with lots of other links in threadhttp://www.gmfullsize.com/forum/showthread.php?t=94223

On Board Air
http://gmfullsize.com/forum/showthread.php?t=43545

SAFETY
Safety concerns for the average trail rig
http://www.pirate4x4.com/forum/showthread.php?s=&threadid=196752


Shackle Flip

http://gmfullsize.com/forum/showthread.php?t=161780
http://www.gmfullsize.com/forum/showthread.php?t=213451
http://www.gmfullsize.com/forum/showthread.php?t=215010

Shackle Flip -
TOTW Flippin out!
http://www.pirate4x4.com/forum/showthread.php?s=&threadid=119855
http://www.offroaddesign.com

SOLID AXLE SWAP (SAS)
Cajun4x4's thread
http://gmfullsize.com/forum/showthread.php?t=72622

The_Law's thread
http://gmfullsize.com/forum/showthread.php?t=73188

Bggrnchvy's leaf sas thread
http://gmfullsize.com/forum/showthread.php?t=18545

AxisT6's OBS 2wd-4wd thread
http://www.gmfullsize.com/forum/showthread.php?t=128085

BabyBlueBeast
http://www.gmfullsize.com/forum/showthread.php?t=187016

NBS 99-2006 SAS

Black4x4's thread
http://gmfullsize.com/forum/showthread.php?t=72857

lousieg55's thread
http://www.gmfullsize.com/forum/showthread.php?t=93968

BrainZ-71's build Ford axles with 3 link front
http://www.gmfullsize.com/forum/showthread.php?t=178722

NNBS SAS
GreatWhiteZ71's thread
http://www.gmfullsize.com/forum/showthread.php?t=155949


Front 4 link SAS by bggrnchvy
http://gmfullsize.com/forum/showthread.php?t=103138

CowboyKyles 3 link SAS with Ford Axles
http://www.gmfullsize.com/forum/showthread.php?t=165491

http://www.pirate4x4.com/forum/showt...ghlight=SAS*

TOTW SAS in a S-10/S-15
http://www.pirate4x4.com/forum/showthread.php?t=144003

Bump Stop Tech.

http://gmfullsize.com/forum/showthread.php?t=49352

Quote:
Originally Posted by steveh
With the amount of lift a lot of us run, bumpstops area must.
So, how do you figure out how much Bumpstop to use? IE, what should be considered when designing front bumpstops

* What kind of bumpstop?
* How much space for travel?
* Standard vs. air or hydraulic?
* Is it even Important??

Quote:
Originally Posted by jca
First I measure the spring pack and see how thick it is. I then tear the spring packs apart. I put the main leaf back in and a wood block that simulates the spring pack thickness. I then cycle the suspension.
By cycling the suspension, I droop the axle all the way out and look for anything binding. I also make sure the shocks are not fully extended and being the limiting factor/stopper.
Jack the axle up so that the spring main leafs are flat. I turn the wheels both left and right. Make sure that nothing is binding and the shocks are not bottomed out and being used as a bump stop. Take a measurement from where you want to mount the new bump stop to where the strike zone will be. You can mount the bump on the axel and the strike zone would be on the frame (as shown in pics above) or you can mount the bump on the frame and the strike zone would be on the axel. In this example lets say the measurement is 4".
Jack the drivers side up to your measured distance in the step above (4") and let the pass side droop all the way down. Turn the wheels left and right. Again looking for anything binding or hitting. Take a good look at you shock cans and make sure nothing is hitting them in this postion.
Repeat step above but this time have the pass side up to your measurement and the drivers side drooped out.
If all of the above steps are taken and no binding/hitting/problems are found then 4" is you magic number.
This is how I do it. Normally I am setting up a whole suspension when I am doing this. That includes the springs, shackles, shocks and bump stops. I have left out all the steps for everything else and tried to keep this about bump stops only

Cross Over Steering -
Discussion topic Cross over
http://coloradok5.com/crossoversteering.shtml
http://www.pirate4x4.com/tech/billavista/Steering/Steering_Research/steeringresearch.htm

Link suspension info
The ultimate listing of the most important link suspension posts.......

THE GOD OF SUSPENSION...[for those of you who don't know]
http://www.pirate4x4.com/forum/showthread.php?t=7503

LINK SUPSENSIONS FOR DUMMIES
http://www.gmfullsize.com/forum/showthread.php?t=103138
http://www.pirate4x4.com/forum/showthread.php?t=168577

New Version of my 4-link Analyzer
http://www.pirate4x4.com/forum/showthread.php?t=204893

ExcelCAD - Awesome Link design Program
http://www.gregblanchette.com/pages/1/index.htm


Springs -

52" Front spring install
http://www.pirate4x4.com/forum/showthread.php?t=469853

Misc. Spring Information
http://www.4x4spot.com/spring_swap_info.htm
http://www.4x4spot.com/misc__spring_information.htm


Spring Perch Width dug by Silver98z71
OOBS 73-87 1Ton Spring perch width is 40.5"
OOBS '73-'87 1/2ton-3/4ton spring pad span is 42.5".
OBS 88-98 Spring perch width is 47"
NBS 99-06 Spring perch width is 49"


Steering

Cross Over Steering -
Discussion topic Cross over
http://coloradok5.com/crossoversteering.shtml
http://www.pirate4x4.com/tech/billavista/Steering/Steering_Research/steeringresearch.htm

Hydro Assist by Bggrnchvy with full hydro build
http://gmfullsize.com/forum/showthread.php?t=49128

Tapping box for Hydro assist
http://www.pirate4x4.com/tech/billavista/HydroAssistTap/index.html

Billavistas steering articles
http://www.pirate4x4.com/tech/billavista/Steering/Steering_Index/SteeringIndex.htm

Tire Sizing Metric Conversion
305/70r16 = same height as 285/75r16
now in 17" its different
285/70r17 is shorter than 305/70r17

If you research metric tire sizes youll understand. It is fairly simple to understand
305=section width
70= aspect ratio
r= Radial Construction
17= rim diamater
to get the stadard height do these calcs for any metric tire
section width*aspect ratio*2/25.4(25.4 MM in 1 inch)+rim diameter= Standard tire height

Example 305*.7=213.5*2=427/25.4=16.81+17=33.8"
Torsion bars
Green keys= 1/2 ton stock (lifts 3/4 ans 1 tons)
Purple Keys = 3/4 ton and 1 ton stock (lowers 1/2 tons)
Ford keys= lift 1/2 tons
Rough country HD bar upgrades are common. Less sagging for larger tires.
Flip flop orientation for installation NBS trucks.

CHEVY TORSION BAR CODES AND RATINGS:

15048307-LH (code XK) (Max torque 4553)
15048308-RH (code XK) (Max torque 4553)

15048309-LH (code XL) (Max torque 4626)
15048310-RH (code XL) (Max torque 4626)

15712407-LH (code WX) (Max torque 4863)
15712408-RH (code WX) (Max torque 4863)

15048311-LH (code XM) (Max torque 5638)
15048312-RH (code XM) (Max torque 5638)

15058267-LH (code YH) (Max torque 5913)
15058268-RH (code YH) (Max torque 5913)

15712409-LH (code WY) (Max torque 5913)
15712410-RH (code WY) (Max torque 5913)

15528957-LH (code GG) (Max torque 6709)
15528958-RH (code GG) (Max torque 6709)

15712411-LH (code WZ) (Max torque 7267)
15712412-RH (code WZ) (Max torque 7267)

15528963-LH (code GK) (Max torque 8615)
15528964-RH (code GK) (Max torque 8615)

15528965-LH (code GL) (Max torque 8782)
15528966-RH (code GL) (Max torque 8782)

15732338-LH (code XG) (Max torque 9054)
15732339-RH (code XG) (Max torque 9054)

15528959-LH (code GH) (Max torque 7161)
15528960-RH (code GH) (Max torque 7161)


Ford Keys:
Here is a writeup by 01jackedZ

Ford keys can be used on OBS and NBS trucks. They are a higher indexed key from a 1997 to 2003 Ford F-150 that swap into the new 4wd trucks. They are for half ton trucks only. They can be found at any local ford dealer by asking for torsion adjusters or the part number is:
(2) XL3Z5B328CA
Here is a picture of a new Ford Torsion Key installed.

Torsion Key Install:
Ford Keys and new Torsion Bars are very easy to install yourself. You can use a 2 arm gear puller, some use a balljoint press, or a special torsion unloading tool that can be rented from a member here:
http://www.gmfullsize.com/forum/showthread.php?t=78832

Leveling Kits:In most cases they are the same thing in a different box. Don't spend money on ebay or from an off-road shop when you can get new keys for $60 from any dealership.

3/4 Ton Trucks:
If you have a 2500 you don't want to use Ford Keys for your truck. They are not indexed correctly. Instead stock 1500 keys will get you more height in the front. "Green" Keys will also allow you to crank up higher. GM Part Number:
#15592573

Replacing Torsion Bars:
The Other question that often goes with keys is torsion bars. The bars can be replaced along with the keys for more height in the front end or if the current bars are wearing out. You can tell when they begin to wear out when they start to sag. The front of the truck will sink lower or it wont hold its height when the keys are cranked up. A popular choice is Rough Country Torsion Bars (GL):

The bars are for a 1988 to 1998 Silverado but work in a 99-06 as well. They have to be flipped front to back and then from left side to right side in order for them to load.

How big of a tire can you fit?:
This question is going to vary from truck to truck. But in general and on stock wheels a 285/70/17 or a 285/75/16 will fit with zero problems. The biggest question is can you fit a 315? Yes it can be done on stock wheels with a little bit of trimming. Even on a regular cab. On aftermarket wheels you want to get as close to stock backspacing as possible or it wont fit. Here is an example of a regular cab on 315's. Ford Keys cranked and a 3 inch rear block on MTZ's


How bad is it for my Truck?:
Cranking your front end is going to increase your angles in the front and will decrease the life of your ball joints, steering components and CV's. It might wear them out quicker but many members have been running cranked front ends for long periods of time with no ill side affects yet. This simply means it wont wear them out overnight. Here are pictures of members trucks with good CV angles (these have been confirmed by other members in a seperate thread:
(Deranged, Dustin) RC Bars and Ford Keys


(01jackedZ, my truck) RC bars and Ford Keys


Will I have to replace my shocks?:
Yes. There is no way around it if you crank it up. A lot of questions come up about how the truck will ride. It will ride stiffer, but it can be brought almost to stock in my opinion with the right shocks. Here is a list of several shocks that many members have run and are happy with:
Bilstein: (made specifically for a silverado with cranked Ford Keys) Part #BE5-C153-T0
Skyjacker: Nitro Shocks
Rancho: ES900 Shocks

How much height can I expect to gain?:
With Ford keys alone you can expect to add about 1.5 to 2 inches and about an inch or a touch more with RC Bars. With both Bars and Keys you can add about 3 inches. I have both on my regular cab z71 and added about 3 inches in the front.

TRANSFER CASE -

NP246/243 swap to NP241
How to get your tranny to shift correctly in lo range after the swap.
http://www.gmfullsize.com/forum/showthread.php?t=154868

Np241
manual shift case, chain drive found in many trucks, suburbans, and tahoes. Aluminum case, passenger side drop and driver drop available. 1/2 tons had 27 spline inputs, 3/4 and 1 tons had 32 spline inputs. ATF as lubrication

Np243
electric shift case, chain drive found in all IFS trucks, suburbans, and tahoes. Aluminum case, driver drop. 1/2 tons had 27 spline inputs, 3/4 and 1 tons had 32 spline inputs. ATF as lubrication

Np246
Electric shifting auto trac case with auto 4x4 option. Found some 99+ trucks, suburbans, and tahoes. has cluthes in case that transfers power between front and rear outputs. IIRC they were found in 1/2 tons only.

Posted by Bggrnchvy

241-32 spline outputs in all cases.

208-chain driven aluminum case. 27 or 32 input spline depending on transmission(TH350, 700r4 or TH400). Not sure if it ever came behind the SM465 but if it did it should have a 32 spline input for the later model 465's. Not sure on output splines but I would assume like other NP Al/mag cases the models share shafts so whatever they are is the same no matter input spline. Uses ATF. Has a slip yoke on the rear output, no SYE avaliable other than some custom Dodge unit fixed yoke swaps.

203-Fulltime iron case with a chaindrive and reduction via planetaries. Close to 200lbs and not highly regarded, availiable in 10, 27 and 32 spline variants. The planetary box is a common part used to make the venerable 203/205 doubler. ATF recomended with planetaries.

205-Iron housing, gear driven case. Fairly compact in comnparison to the 203 and weighs in around 100lbs. Spec'd for use of gear oil, and ATF depending on the year and vehicle it was in, both can be used just not at the same time. Front outputs 30 and 32 spline, rear can be solid yoke or slip yoke depending.

That should all be right, some items I didn't add as Im unsure.

There is a bunch of random tech threads Ive thrown together including one with driveshaft tech floating around.

Doubler/ Dual Transfercase INFO
SM465-SM465 Ratios
http://www.pirate4x4.com/forum/showthread.php?t=256897

241/205 doubler
http://www.pirate4x4.com/forum/showthread.php?t=757049

241/205 doubler
http://www.pirate4x4.com/forum/showthread.php?t=871556

billavista's Doubler article
http://www.pirate4x4.com/tech/billavista/Doubler/index.html

TRANSMISSION -

Removal of transmission cooler line quick diconnects
http://www.gm-trucks.com/forums/index.php?autocom=ibwiki&cmd=article&id=510

SM465 sloppy Shifter fix
http://www.pirate4x4.com/tech/billavista/sm465/index.html

4l80E Rebuild by Bggrnchvy
http://gmfullsize.com/forum/showthread.php?t=83773

4L60E to 4L80E swap into 96+ half ton
http://gmfullsize.com/forum/showthread.php?t=56534
http://gmfullsize.com/forum/showthread.php?t=59756

Posted by CoonBottom:
The T400 and T350(non lock up) both have roughly a (TH400) 2.48:1 1st gear and a a 1:1 final gear with a none lock up TC. This is also for a 1:1 in the transfer case (high range).
For an all around gear that is good for highway and power, 3.73 for 33. 4.10 for 35, 4.56 for 38, 4.88 for 40, 5.38(or the more common 5.13 with the 14 bolts) for a 44.

The 4L80e also has a 2.48:1 (iirc, some one correct me and i will fix this) but has a .75:1 OD and a lock up TC which drops the rpms even more but this is still a good gear choice.

700r4/4L60e and has a 3:06 first gear and a .70:1 OD with a lock up TC. Just back off the deepness of the gear.
ie- 4.10 for 38's instead of 4.56's.

This is just to get you more or less back to stock form. Depending on if you are rock crawling or running a more agressive tire (a bogger will require more leverage than say an A/T in the mud) then, well, obviously you will want a higher gear ratio.

http://www.gmfullsize.com/forum/showthread.php?t=75056

Vehicle Recovery
http://www.gmfullsize.com/forum/showthread.php?t=75056

Vendors

Gmfullsize Vendors. Support locals
http://www.12voltguy.com
http://www.advanceadapters.com
http://www.bluetorchfab.com
www.diy4x.com/
http://www.gotpropane.com
http://www.offroaddesign.com/
http://www.offroadsolutions.com
http://www.polyperformance.com
http://www.rockstomper.com
www.sky-manufacturing.com/

Welding Trail Fix ONLY
http://www.gmfullsize.com/forum/showthread.php?p=1308103#post1308103
 

·
Bayou Surface Drive, LLC
Joined
·
7,077 Posts
Discussion Starter #2
Re: Chevy FAQ Thread ***possible sticky***

I want all knowlegeable people to post up in here and i can post their replies in the main post with their recognition. You guys know who you are.
 

·
Registered
Joined
·
617 Posts
Re: Chevy FAQ Thread ***possible sticky***

Definite sticky.

Good write up Marcus, now I am goin to waste my day and read all of those threads:head:
 

·
bitter southern gun owner
Joined
·
1,142 Posts
Re: Chevy FAQ Thread ***possible sticky***

sticky material right here

thanks to the d44 vs 10 bolt thread i just shut up my friend with his jeep saying his axles with 38's are stronger than my 10 bolt with some 33's


great post :thumbsup:
 

·
this
Joined
·
1,584 Posts
Re: Chevy FAQ Thread ***possible sticky***

Differentials – Gearing

Gearing Suggested by tire size.
31 or smaller tire 3.42-3.73
33 inch tire 3.73-4.10
35 to 38 inch tire. 4.56-5.13
39-larger tire. 5.13-5.38

This depends on the transmission. (like 1st gear ratio and OD/lock up)
Edit: to clarify, that gearing suggestion should be broken down by transmission.

Dont forget the 203/205/208 tcases!

EDIT for tech
The T400 and T350(none lock up) both have roughly a 2.5:1 1st gear and a a 1:1 final gear with a none lock up TC. This is also for a 1:1 in the transfer case (high range).
For an all around gear that is good for highway and power, 3.73 for 33. 4.10 for 35, 4.56 for 38, 4.88 for 40, 5.38(or the more common 5.13 with the 14 bolts) for a 44.
The 4L80e also has a 2.5:1 (iirc, some one correct me and i will fix this) but has a .75:1 OD and a lock up TC which drops the rpms even more but this is still a good gear choice.

700r4/4L60e and has roughly a 3:1 first gear and also a .75:1 OD with a lock up TC. Just back off the deepness of the gear.
ie- 4.10 for 38's instead of 4.56's.

This is just to get you more or less back to stock form. Depending on if you are rock crawling or running a more agressive tire (a bogger will require more leverage than say an A/T in the mud) then, well, obviously you will want a higher gear ratio.
 

·
NCOR
Joined
·
8,449 Posts
Re: Chevy FAQ Thread ***possible sticky***

241-32 spline outputs in all cases.

208-chain driven aluminum case. 27 or 32 input spline depending on transmission(TH350, 700r4 or TH400). Not sure if it ever came behind the SM465 but if it did it should have a 32 spline input for the later model 465's. Not sure on output splines but I would assume like other NP Al/mag cases the models share shafts so whatever they are is the same no matter input spline. Uses ATF. Has a slip yoke on the rear output, no SYE avaliable other than some custom Dodge unit fixed yoke swaps.

203-Fulltime iron case with a chaindrive and reduction via planetaries. Close to 200lbs and not highly regarded, availiable in 10, 27 and 32 spline variants. The planetary box is a common part used to make the venerable 203/205 doubler. ATF recomended with planetaries.

205-Iron housing, gear driven case. Fairly compact in comnparison to the 203 and weighs in around 100lbs. Spec'd for use of gear oil, and ATF depending on the year and vehicle it was in, both can be used just not at the same time. Front outputs 30 and 32 spline, rear can be solid yoke or slip yoke depending.

That should all be right, some items I didn't add as Im unsure.

There is a bunch of random tech threads Ive thrown together including one with driveshaft tech floating around.
 

·
NCOR
Joined
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8,449 Posts
Just a note the TH400 and 4l80e have a 2.48:1 1st gear and the 700R4 and 4l60e use a 3.06:1 1st.
 

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this
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1,584 Posts
Just a note the TH400 and 4l80e have a 2.48:1 1st gear and the 700R4 and 4l60e use a 3.06:1 1st.
Thanks for the exact numbers.
The T350 has a 2.52:1 1st right? I will google it later to make sure and delete this post then.

I also need to find the gear ratios of the standard transmissions. Didnt DE have a page up that had those?
 

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JetBlue
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2,306 Posts
Lots of good info. But, some of your links are shit.

-bZj
 

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Hillbilly Deluxe
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1,096 Posts
heres my 2 cents

i know this works for obs

a good 33" A/t fits with a little crank or just stick on
a good 35 will fit with atleast a 2" b/l and crank
x10 wheels and 36's fit with cut outs, 3" bodylift and crank. will have minimal rub
most 6" suspensions will fit 35's easiliy
 

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LOUISIANA BORN AND RAISED
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933 Posts
Marcus - You're telling me I can fit a 315 on my OBS Tahoe with NO Lift? Of course as of now I have the Torsion bars cranked but thats it. :think:

If this is the case I know what I'm about to go buy :pepper:

:popcorn:
 

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Registered
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1,418 Posts
just read this it all looks good except i am about 99% sure i have the LQ9 in my 06 sierra denali might want to add this to the list for the LQ9...other then that i think just about every question is answered in here! nice job
 

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meow
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15,748 Posts
Just a little fyi, the aftermarket bumper link to pirate is a no go for me.

Would be neat if we could put this in the 'tech section' and brake down the categories even more :) Things like upgrades and assembly break downs. :bowtie:
 

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Black ___, don't know yet
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28 Posts
the NV3500 also goes in the obs trucks, my 96 has one, not sure what all other years have it though.
 

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haz 12"s!
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4,531 Posts
Holy crap... this is the first time Ive looked through this. We should keep this thread and close the forum down! Great job!
 
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