[g_unit77]

I would deff suggest re-gearing with 40's, 4.88's would be the way to go and if u supercharge ur gears will be fine, but ur tranny will need help.

 

[Senorpedro18]

you should definetely regear. i would go with 4.88s. and then about the SC, i dont think the SC will make much of a difference interms of needing to regear. its simply more power and has nothing to do with how much effort is needed to turn the tyres.

 

[Andy]

yes, but regearing would take a hell of alot off of your transmission. If you supercharge youll most likely blow that cheezy ten bolt as well as your stock trannie and youll need a 14 bolt. I would maybe even go with 5.13's with 40's and 20's for extra power.

 

[carterbeauford]

Im going to be doing a 12-15inch lift on a 04 ext cab silverado 4x4 with the 5.3. I am going to be most likely running 20s and 40s. Do i need to regear? What will happen if i dont?

assuming you have 3.73s, your truck would take about 5 minutes to get to 60mph and your tranny wouldn't last very long.

 

[01whiteoffroad]

id go with 5.13's if you're gonna run 20s and 40's. and upgrade the rear end if you plan to put so much power to it with a SC

 

[Dark Eternal]

exactly what they all said, REGEAR. Also if you supercharge and have a heavy foot count on teh 10 bolt grenading.

 

[Slvrpismochevy96]

Howcome you posted this sandaddiction...they are all telling you exactly what i told you on AIM :read:

 

[ituck22s]

regear...i drove around a 04 ccsb on 40's and 20's with a 5.3 for a few days with stock gears and it was sloooooooooowwwww....the kid ended up putting 5:13's in...a whole lot better

 

[Alden]

4.88 or 5.13

 

[Slvrpismochevy96]

hey where in fresno are you?

 

[Alden]

I live in north fresno, go to fresno state.

 

[Slvrpismochevy96]

Thats funny, i was supposed to start there on monday but im takin a semiester off, mechanical engineering

 

[Alden]

Cool. I have another 2 years of pre-pharmacy classes, and then hopefully i'll transfer to UOP. What sucks is Pismo is going to be a 4 hour drive if I end up in stockton.

 

[Slvrpismochevy96]

O, cool deal. yah thats almost double the driving time, now that im out of high school i probably wont even see pismo too often, but ill most likely be transfering to cal poly then ill only be 15 minutes away

 

[Alden]

Lucky.
I don't think i've ever seen you driving around. Where did you go to high school?

 

[zubyc]

well back to the topic...
I have 4.88 and my truck is slow so you might even want to think 5.13.

 

[Alden]

If you plan on adding a super charger later on, 5.13's in a 10 bolt will blow up. The teeth on 5.13's, or even 4.88's are so close together, and it wouldn't take much to strip the teeth if you had a super charger and a lead foot.
I know I originally said 4.88's or 5.13's, but if you keep that 10 bolt, 4.56 might actually be a better choice. The super charger would make up for the loss in gear ratio, and the 10 bolt will stay in one piece.

 

[zubyc]

either way, you are wanting to go big and with alot of power so your 10bolt is a ticking time bomb....Instead of wasting money on it like i did, just 14 bolt now and you'll be fine

 

[Slvrpismochevy96]

I went to school in kerman, I have a lifted silver 96 chevy...if you have seen me thats most likely what i was driving but its going to be for sale here shortly.

Yes back to the topic, with 40's you most likely should get 4.88, especially with a supercharger, but if you want you can get 5.13 either way your truck will be slow. If you mostly do city driving then get 5.13, if you are on the freeways a lot then get 4.88.

Anything you choose you need to ditch the 10 bolt, you would be a bit foolish to keep that under your truck with 40's and a blower under the hood.