http://store.summitracing.com/partde...N=120%20301350

3.73 ratio for 27spline, 2 series carrier.

7.5" ring gear diameter.



my car has the ****ty 2.77 in the rear end.

this 3.73 is the correct fitment for my rearend right?

 

you need a richmond pn 49-0007-1 3:73 for 3:08 and numerically lower carriers

 

2:77 gears = 9-bolt rear and 7.5 gears only fit 10-bolt rears, so back to the drawning board.

 

I say seach the yards for a 3.45 gear out of a 9 bolt I think they came in the 87-90 lb9 manual trans

or try to find someone that seles new gears for the borg-warner/aussie diff

 

well ede said i need this part number: 49-0007-1

and that link i posted is to that exact part number!

so who is right? ede or DJP87Z28?

 

Well if you have a 9-bolt then ede is wrong!

 

I have ten bolts...

 

Then you don't have 2.77 gears and ede is right.

 

im pretty sure i do..

G80
AXLE POSITRACTION, LIMITED SLIP

GH3
AXLE REAR, 2.77 RATIO



same with my RS, it had 3.08 and ten bolts.

 

ok i lied, i double checked, my 3.08 RS had 10 bolts, my 2.77 iroc does have 9 bolts.

so what do i need? both were 2-series carriers.

 

What car is this for now, the IROC with 2.77's? If so you are almost SOL, parts for 9-bolts are hard to find and are expensive. Nothing that summit has will work.

 

well crap

yes its for the iroc, i was using my RS for reference because it also had a 2-series carrier, and i just assumed my iroc was 10bolt as well..

now that i checked in person, it is 9 bolt

 

does this loook right?

http://www.reiderracing.com/gm912.htm

 

Thats a 9.5" rear you want: http://www.reiderracing.com/gm734.htm

 

Those won't fit either.... they're for a 3-series carrier. The 2.77 rear has a 2-series carrier.

AFAIK there are no "special" gears for the 9-bolt, and no ring gear spacers either. The ONLY way to upgrade a 2-series rear to 3-series gears, is to change out the carrier.

 

Well, back to the drawning board.

 

You may want to spend some time reading this.

https://www.thirdgen.org/techbb2/sho...hreadid=239666

 

thanks, not often i'm right. actually i never picked up on the 2:77 ratio just sort of skimed it and seen 2:73 without really looking and seeing what it really said.