Which gearing would be best for me
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From: South Texas
Which gearing would be best for me
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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You can check out the calculators on this site, it is also where I buy my gears.
http://www.ringpinion.com/Calculators.aspx
http://www.ringpinion.com/Calculators.aspx
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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?
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?
Thread Starter
CF Beginner
Joined: May 2009
Posts: 23
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From: South Texas
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?
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?
As for pulling trailers, my truck does not even have a hitch lol.
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From: South Texas
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From: South Texas
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.
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From: Watson, LA
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.
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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.
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.