i dont realy know much about gears but i wanna get either 3.42s or 3.73s i got 2.73s right now but im confused about the 3 series or 2 series carrier thing what do i need to get before i bring it to a shop to get installed i knwo the gears and pinion and berings is that it help needed thanx

 

You have a 2 series carrier. If it is a 10 bolt (look at the cover and count the bolts) there are companies that make as high as 3.42 for it. You neeed a 3 series carrier for 3.73 gears. If you have a 9 bolt it is very expensive to do gears in it and from what I understand not many places sell them.

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87 Black on Black T/A
T-Tops Digital dash
5.0 TPI S/R Torquer 305 heads Summit TPI cam
204/214 @.050 .420/.442
SLP headers and catback
A4 with 3.42 gears
Fully loaded and everything usually works.

 

You can get 3.73's in a 2 series.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
82camaro

 

im looking in the summit magazine for the gears right now but i dunno which 10bolt gears i have i have an 89 rs there are 8.2dia, 7.5dia, and 8.5 diam oh and there are 2 groups of 8.2 one with pinion stem and other with 25 spline pinion if anyone has a summit magazine they can see what i mean thanx

 

you want the ones listed for the 7.5 inch 10 bolt with a 2 series carrier

Eric

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My 1986 Z28

GM350, T-5, 3.23's, lots of go fast goodies, 4th gen Firebird interior etc...
85 IROC w/ 1364 miles!

You'll always find what you've lost in the last place you look

R.I.P Dale Earnhardt

Moderator at: www.generation-3.com

 

I believe an 89 could have either a 10 bolt with a 7.5 or a 7.625 ring gear or it could have 9 bolt.

I can get you all the 9 bolt parts you need, including gear sets to 4.10.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES, it is a 9 bolt & YES they are 3.73's, not 3.70. I currently have 4.10 gear sets and new series 3 carriers in stock for 9 bolts )
www.koolmeister.com

 

im pretty sure its a 10 bolt in summit i would need the one thats RMG-4900071?? its the 3.73 gear (3.08 lower carrier )

 

If you have 2.73's it's a 10 bolt 2 series carrier. Correct, RMG-4900071, it's the same that I have.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
82camaro