stk350

I need to know if I have a 3.08 or lower carrier. I have the chance to buy a richmond 3.73 gear with install kit for $215.00 brand new never installed. Deal goes through tomorrow so I need to know. What RPO code am I Looking for here?

Marc 85Z28

GU2 is 2.73
GU4 is 3.08

stk350

Thanks man.But all I have in te g's is GW6 and G80. Also, I found those in the center console lid. Maby I'm looking in the wrong place.

Jim85IROC

Bah. My theory went to hell. I just found a guy who apparently had a stock 2.73 posi rear.

87DJP2001

If you have a 350 TPI and those are the RPO codes
GW6 = BW 9-bolt 3:27 ratio
G-80= Limited Slip rear

These are common RPO's with the 3:27 ratio being a up grade.
However: You are out of luck with your good deal on the Richmond 3:73 & install Kit-
They will not work for you.
REASON: If your RPO codes are correct, the gears & kit are 10-bolt parts and will not work in a BW 9-bolt rear axle.

stk350

Damn, well there on ebaymotors under richmond 3.73. with a buy it now price of $215.00!!! Please say limited slip mean posi.

87DJP2001

Yes, Limited Slip is a Posi (GM name for it). You do understand the differences between Between the 9-bolt (GW6) and a 10-bolt?? So don't be tempted by that price, you can not use them.

TheGreatJ

The 9-bolt is a better rear anyway...and 3.27 is not a bad ratio. Most of the 9-bolts came with 2.77s (ugh...) You can get 3.45 or 3.70 gears for the 9-bolt but they're gonna cost you, 9-bolt parts are expensive.

stk350

Sweet. Actually. I know alot about these cars but I'm not to keen on rear ends yet.

87DJP2001

Learn somnething new everyday. And everything is not a bargin on E-Bay, so you saved $215 by asking a question.

irocz8957

it would be alot easier to find a whole new rearend i found one $250 with disk brakes and 3:42 gear put it in my self and saved me alot of money call around to local junk yards and see if ya can find ya one!!!

willis2z

I've got a fm 10 bolt i'll sell ya for 200 plus shipping