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Ok I have a 90 Sierra with a 383 stroker. I want to change the rear gearing I was wondering what would be the best ratio to go with. Also could someone point me in the direction of a good site to buy them off of.
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__________________
Push the gas and the truck goes vroom
This answer depends largely upon what kind of driving you do. The more highway, the lower the gears.(like 342s)
There's mid-range, like 373s(good all purpose) and 410s which aren't too extreme, but give a little more oomph for towing and low end power.
Assuming you're using an off-road vehicle with 33s for muddin' and need the low end, you need something more like 456s.
We need a little more information. First, what does your glovebox RPO code say you already have? (gt4,gt5, etc) Second, what don't you like about the gears you have now?(Too little low end power, not enough gas economy, not enough top end speed,etc.)
Third, do you pull trailers or heavy loads, drive a lot of highway, or what?
This answer depends largely upon what kind of driving you do. The more highway, the lower the gears.(like 342s)
There's mid-range, like 373s(good all purpose) and 410s which aren't too extreme, but give a little more oomph for towing and low end power.
Assuming you're using an off-road vehicle with 33s for muddin' and need the low end, you need something more like 456s.
We need a little more information. First, what does your glovebox RPO code say you already have? (gt4,gt5, etc) Second, what don't you like about the gears you have now?(Too little low end power, not enough gas economy, not enough top end speed,etc.)
Third, do you pull trailers or heavy loads, drive a lot of highway, or what?
My truck is a street/strip truck. Well I guess that would be the best description. I want some more acceleration. It is good but I know it could be better.
As for pulling trailers, my truck does not even have a hitch lol.
__________________
Push the gas and the truck goes vroom
If you really wanted some pick up, I would get some 4:10s. You will burn more gas though. Good all around, get 3:73s. Chances are that you already have 3:73s.
__________________ 1994 Chevy C3500
6.5 Liter Turbo Diesel
Stock
140,000 Miles
My Work Truck 1996 GMC K1500
5.7 Liter V-8
Z71
316,000 Miles
3" Lift -- 33" Hankook M/Ts
My Work and Play Truck
Many Other Mods.
If you really wanted some pick up, I would get some 4:10s. You will burn more gas though. Good all around, get 3:73s. Chances are that you already have 3:73s.
K 4.10 it is then. I already onl get around 8 mpg so a little less won't bother me.
__________________
Push the gas and the truck goes vroom
You're gonna be really PISSED if you get 410s, and you had(OOPS!) 410s...
I havent verified yet. But I will before I buy. The reason I think that they are not 4.10 is because my truck does not seem to have as much get up and go as it should.
__________________
Push the gas and the truck goes vroom
Let me know what them prices look like if you don't mind. I'm looking into getting 4:10s. By the way, if i'm not mistaking, you can call a chevy/gmc dealer around you and give them your vin and they can look up the gear ratio you hav now.
__________________ 1994 Chevy C3500
6.5 Liter Turbo Diesel
Stock
140,000 Miles
My Work Truck 1996 GMC K1500
5.7 Liter V-8
Z71
316,000 Miles
3" Lift -- 33" Hankook M/Ts
My Work and Play Truck
Many Other Mods.
It's about 1600$ to 2000$ out the door for new gears, if you have it done by a shop.
Be sure the shop reprograms your PCM with the new gear ratio, this way your speedometer will still be accurate, and your brake sensors won't go nutz.
Look at your RPO codes in your glove box. It's a white sticker which says "Service Parts Identification" and has a bunch of 3 digit alpha-numeric codes which identifies your truck's specific options packages. GT4 is 373s,GT5 is 410s, and GT6 is 342s.
There's a thread which identifies most of the RPOs in the Tech section of CF.
Which gearing would be best for me
