Can the gear ratio in a GM 10 bolt be changed by replacing the ring and pinion or is a whole new rear end required? I wanna put 3.73s in my '91 RS.

 

you just have to swap the ring and pinion. get one the the carrier your rearend has
What gears do you have now?

 

Your RS probably has an open rear end now, right? Go to www.slponline.com and get their take off torsen posi for $100. Then get your 3.73 gears (3 series carrier with that posi), along with the correct speedo gears for your trans, so your speedo will read correctly. Then pay a good shop to install it all for you, as gear installs are very tricky and require special equipment. Good luck!

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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Thanks! I'll check into that. I have 2.73s in the RS and they suck! My '85 Z28 has 3.23s (3.27s?) and it accelerates soooooo much quicker than the RS. I think the TPI induction has a little to do with that, but I know my RS could move faster with steeper gears!