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Discussion Starter · #1 ·
my truck (04 gmc rcsb v8) has the factory hitch, electrical hookup out back and i think a overload spring.

is there anything else thats in the tow package? heavier cooling system? trans cooler? anything?
 

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There's two or three separate towing packages that include various combinations of the things you mentioned.

I have the "Heavy Duty Trailering Equipment" package which I think is the upgraded alternator and trans cooler and the "Handling/Trailering Suspension Package" which I think is the upgraded springs. I think my hitch and wiring are part of the SLE trim level but are a package in a lower trim level, or something like that.

http://lh5.ggpht.com/_oNsRR_T1Qx0/SCgnf-TtpNI/AAAAAAAACJo/zvbssik6yVU/d/IMG_0753.JPG

Related RPO codes I have:
UY7 WIRING HARNESS TRUCK TRAILER, HD
VR4 TRAILER HITCH WEIGHT DISTRIBUTING PLATFORM
Z82 TRAILER PROVISIONS SPECIAL EQUIPMENT, H.D.
Z85 CHASSIS PACKAGE INCREASED CAPACITY
KNP COOLING SYSTEM TRANS, HD
K68 GENERATOR 105 AMP

Ok, reviewing my RPO codes, it says I have this:
6YH COMPONENT FRT LH COMPUTER SEL SUSP (6YH)
7YH COMPONENT FRT RH COMPUTER SEL SUSP (7YH)
WTF? That sounds like the suspension where you press a button to select between a comfort ride and heavier capacity, but those codes seem to say I only have it on the front (which wouldn't make sense), and I know I don't have it there anyway.

Also, LOL at this:
NG1 CERTIFICATION EMISSION, GEOGRAPHICALLY RESTRICTED REGISTRATION FOR VEHICLES UP TO 6,000 LBS GVW
C7H GVW RATING 6,400 LBS/2,900 KG

Sorry,
 

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Discussion Starter · #3 ·
so how can i check which i have? i can look at my code list if needed

edit:
went looking at my RPO list, this is the ones that have stuck out so far
z85: increased capacity
z82: special equipment HD
z83:solid smooth ride
yd6:base spring (doesnt make sense)
vr4: weight distributing hitch
knp: trans cooler
 

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See if you have z82 on your code list; that would be towing. Z85 would be the other suspension. You can have both, like holycow does, which would be a good combo for trailering. You can also have the more well known z71, which is the offroad package, but is not "advertised" as providing better trailering. As with everything, you may have certain aspects you'd find in a specific package, but may not have the package, itself.
 

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I'd definitely look for the auxilliary transmission cooler, located in front of the A/C radiator (which itself is in front of the engine radiator) across the bottom. That's easy to check.

What do you want to tow?
 

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Discussion Starter · #6 ·
i have no question that i can tow what im needing to tow. its a 65 mustang (3k lbs ish) on a 16 ft trailer. dads truck does it all the time in his 4.6 4x4 truck. its just something thats good to know. his truck does NOT have the tow package. my 5.3 will scream compared to his sixxer.

covah, my codes are listed
 

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If it's a car carrier trailer, definitely no problem.


If it's a deckover flatbed (which is much heavier), you'll want at least the equipment I have. Mine was fine, but another ton was really pushing it.

Here's my truck dragging a deckover with my 3500 pound Buick:


Here it is with an 18' truck box:
 

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I have an 05 Silverado 5.3 ec short bed that I got new and it had the towing package here is what it came with on the options, it would appear there is a bunch of stuff on there related to towing and stuff.

AG1 - SIX-WAY POWER DRIVER SEAT
AG2 - 10-WAY POWER PASSENGER SEAT
AJ1 - DEEP TINTED GLASS
AL0 - SENSOR INDICATOR INFLATABLE RESTRAINT FRT PASS
AM7 - FOLDING REAR SEAT
AN3 - FULL FEATURE BUCKET SEATS
AU0 - KEYLESS REMOTE DOOR LOCK
AU3 - POWER DOOR LOCK SYSTEM
A31 - POWER WINDOWS
B30 - CARPETING, COLOR-KEYED
B32 - FRONT COLOR-KEYED FLOOR MATS
B33 - REAR COLOR KEYED FLOOR MATS
B85 - BRIGHT BODY SIDE MOLDINGS
CF5 - ELECTRIC SLIDING SUNROOF INCLUDING HOMELINK UNIVERSAL TRANSMITTER
CJ2 - AIR COND., DUAL ZONE AUTOMATIC
C49 - ELECTRIC REAR WINDOW DEFOGGER
C7H - GVW RATING - 6,400 LB
DF5 - ISRV MIRROR W/COMPASS & TEMP
DK8 - DELUXE OVERHEAD CONSOLE
DL3 - OSRV MIRROR W/DRIVER SIDE AUTO DIMMING, PWR FOLD & ADJ, HEAT, TURN SIGNAL
DT4 - ASHTRAY MUFFIN
D07 - CUSTOM FRONT FLOOR CONSOLE
EVA - EVAP EMISSION REQUIREMENT
E63 - FLEETSIDE BODY
FE9 - 50-STATE EMISSIONS
FK2 - TORSION BAR SPRING ADJUSTMENT
FK3 - TORSION BAR SPRING ADJUSTMENT
GU6 - REAR AXLE 3.42 RATIO
G80 - LOCKING REAR DIFFERENTIAL
JF7 - BRAKES, 17" DISC/DRUM
JJG - FRT END SUBASSEMBLY
KG3 - 145 AMP ALTERNATOR
KNP - HD AUX TRANS. COOLING SYS
KUP - THROTTLE CONTROL ELECTRONIC
K34 - CRUISE CONTROL
K47 - HIGH CAPACITY AIR CLEANER
L33 - VORTEC 5.3L 310HP ALUM BLK V8
M30 - 4-SPD AUTOMATIC TRANSMISSION
NP5 - LEATHER WRAPPED STEERING WHEEL
NP8 - AUTOTRAC ACTIVE TRANSFER CASE
NT8 - EMISSION SYSTEM FEDERAL, TIER
NZZ - OFF ROAD - SKID PLATES
OSG - OSHAWA ASSEMBLY
PDB - SAFE & SOUND PACKAGE: * AM/FM CD STEREO, W/ CD, CASS. (REPLACES 6-DISC CD) * XM SATELLITE RADIO - OVER 130 CHNLS OF DIGITAL ENTERTAINMENT SERVICE FEE EXTRA.1ST 3MOS.INC
PDU - LIGHT DUTY POWER PACKAGE: *VORTEC 5.3L 310HP ALUM BLK V8 *LOCKING DIFFERENTIAL-REAR AXLE *HD TRAILERING EQUIPMENT P25 - 17" ALUMINUM WHEELS
QVL - P265/70R17 ALS BW TIRES
R9U - GM ACCESS - AUTOBOOK IDENTIFIER
SAF - SPARE TIRE LOCK SLM - STOCK ORDERS
TR3 - CHROME GRILLE TSM - PROCESSING CODE - SUSPENSION
T96 - FRONT FOG LAMPS
UB1 - AM/FM STEREO W/CD, CASSETTE AND BOSE SPEAKER SYSTEM
UE1 - ONSTAR SYSTEM INCLUDES 1 YR SAFE & SOUND UG1 - HOMELINK
UK3 - REDUNDANT RADIO CONTROLS
UQ7 - BOSE SPEAKER SYSTEM
U2K - XM SATELLITE RADIO - OVER 130 CHNLS OF DIGITAL ENTERTAINMENT SERVICE FEE EXTRA.1ST 3MOS.INCL VB3 - CHROME REAR BUMPER
VG3 - CHROME FRONT BUMPER
VR4 - WEIGHT DISTRIB. PLATFORM HITCH
VXS - COMPLETE VEHICLE LABEL
V73 - STATEMENT OF VEHICLE CERT.-U.S. /CANADA
XVL - FRONT TIRE P265/70R17-113S
X88 - CHEVROLET CONVERSION
YD3 - BASE EQUIP FOR SCH GVW PL-FT AX
YD6 - BASE REAR SPRING
YE9 - SILVERADO YVL - REAR TIRE P265/70R17-113S
ZVL - SPARE TIRE P265/70R17-113S ZY1 - SOLID PAINT
Z82 - HD TRAILERING EQUIPMENT
Z85 - HEAVY DUTY SUSPENSION
1SC - LT DECOR INCLUDES: * FULL FEATURE BUCKET SEATING * OSRV MIRRORS W/DRIVER SIDE AUTO DIMMING, PWR FOLD & ADJ. HEAT, TILT & TURN SIGNAL * REAR WINDOW DEFOGGER * DEEP TINT GLASS * AUTOTRAC TRANSFER CASE * FRONT FOG LAMPS * AM/FM STEREO W/ 6-DISC CD CHANGER & BOSE SPEAKER SYS * ALUMINUM WHEELS * POWER LOCKS & WINDOWS * REMOTE KEYLESS ENTRY WITH CONTENT THEFT ALARM * ISRV MIRROR W/COMPASS & TEMP * LEATHER WRAPPED STEERING WHL * BODY SIDE MOLDINGS * ONSTAR SYSTEM INCLUDES 1 YR SAFE & SOUND * REDUNDANT RADIO CONTROLS * FLOOR COVERING * AUTOMATIC A/C * GRILLE, COLOR-KEYED SURROUND
1SZ - TOTAL POWER PAC SAVINGS
25U - DARK BLUE METALLIC 52I - TAN INTERIOR TRIM
522 - TAN 6YH - COMPONENT FRT LH COMPUTER SEL
7YH - COMPONENT FRT RH COMPUTER SEL
 

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z82 tow package includes g80 locking rear, trans. cooler, hitch platform with 2 inch ball,7 wire harness, harness for brake controller,single wire for center high mounted stop lamp, z85 suspension -(46mm monotube shocks,34mm front stabilizer bar),4L60 4 speed auto 8.75 rear.... Maximum tow package has 9.5 rear ,4:10 gears ,heavy duty cooling,4L70 4 speed automatic,heaver springs. 07 nnbs
 

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what is the rpo code for the maximum tow package? How can you tell the 8.75 from the 8.5 rear end? Also for my rear end I put on a ta performance aluminum diff cover that holds almost a quart more and has a drain plug and fill plug in the back. Pretty nice and looked better than the stock one.

 
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