REAREND QUESTION
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Junior Member
Joined: May 2010
Posts: 2
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From: tulsa oklahoma
Car: 1989 rs camaro
Engine: 383 stroker
Transmission: built th 350
REAREND QUESTION
i have a 1989 rs camaro steel crank, h beam rods, forged keith black pistons, thumper camshaft, 1.5 roller rockers, rpm air gap intake, 750cfm holley and a set of vortec 2.02 1.60 ported heads she makes around 425 hp and 460 ft lbs before my 125 shot of cheater juice... my question is my rearend i belive has the smaller carrier whats the lowest gears i can put in it and if i cant put a set of 3.73s does anybody have a rearend that they want to sell that has the larger carrier.
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Joined: Jul 1999
Posts: 17,268
Likes: 169
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: REAREND QUESTION
Your 7.5" 10 bolt can easily have 3.73 or 4.10 gears put in providing you have a 3 series carrier (posi). 4.56 gears are available but require a special crosspin.
Thread Starter
Junior Member
Joined: May 2010
Posts: 2
Likes: 0
From: tulsa oklahoma
Car: 1989 rs camaro
Engine: 383 stroker
Transmission: built th 350
Re: REAREND QUESTION
I dont have a posi track rearend 'stock' so does that mean i cant use the lower gears and buy a posi track or would it be easier to just buy a complete different rearend
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: REAREND QUESTION
Some of your questions may be answered in the following link:
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
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Joined: Sep 2008
Posts: 3,777
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Re: REAREND QUESTION
Your '89 probably has the smaller 26 spline axles. You can install a 3.73 gear in it. If you have a 2 series differential then you can get the special thick 3.73 set. If you have a 3 series differential then the standard 3.73 will work. If you want a good posi then I recommend the Eaton Posi. Use it and a set of the standard 3.73 gears. You might want to upgrade to the 28 spline Eaton and a set of 28 spline axles for a little more strength.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: REAREND QUESTION
Yep you can get a thick ring gear for 3.73's. I dont know if they have deeper gears than that for 2 series.
You should upgrade to 28spline axles and a 28 spline diff. Abit stronger, it should last. I've had good success with 4th gen rear ends which use 28spline and zexel torsen diffs. They use worm gears instead of clutches to engage posi. I've been in the 9's with over 650whp on my 10 bolt torsen diff. The other rear i had eventually chipped a worm gear and it started to slip when going around turns. That rear survived alot of abuse from a 400whp + 150 shot nitrous car and then my 600+whp turbo car for alittle while before finally chipping
You should upgrade to 28spline axles and a 28 spline diff. Abit stronger, it should last. I've had good success with 4th gen rear ends which use 28spline and zexel torsen diffs. They use worm gears instead of clutches to engage posi. I've been in the 9's with over 650whp on my 10 bolt torsen diff. The other rear i had eventually chipped a worm gear and it started to slip when going around turns. That rear survived alot of abuse from a 400whp + 150 shot nitrous car and then my 600+whp turbo car for alittle while before finally chipping
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