Topic: REAR AXLE RATIOS
in Forum: C4 Driveline Components
Already a Member?
Click Here to Login
Not yet a Member?
Click Here to Register for Free!
SPONSOR AD:: (Our Sponsors help support C4VR)
Standard Member
Moderator
Send PM
Moderator
Joined: 3/20/2009
Posts: 611
Vette(s): Black 1979 L-82
Black 1996 LT1
Black 1999 Coupe
Check the info on the diff. itself??
From what I have read, 2.59 was the predominant gear-set, and the .308 was the sport gear-set. there might be another gear-set for H/O cars (just guessing).
If in doubt (and easy) the best idea is to check the diff. tags, with the idea nobody would install different gears and keep a correct tag on the diff. housing identifying to gear-set inside.
Good luck!
Jim
From what I have read, 2.59 was the predominant gear-set, and the .308 was the sport gear-set. there might be another gear-set for H/O cars (just guessing).
If in doubt (and easy) the best idea is to check the diff. tags, with the idea nobody would install different gears and keep a correct tag on the diff. housing identifying to gear-set inside.
Good luck!
Jim
Standard Member
Moderator
Send PM
Moderator
Duncanville, TX - USA
Joined: 3/18/2009
Posts: 2246
Vette(s): 1985 Coupe-L98/Auto,Bright Red/Carmine.
1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.
For '85, it was a 3.07 ratio.
The choices for '96 were:
2.59
3.07
3.45
You'll need to check your RPO code decal to determine which one you have. The decal should be on one of the rear compartment doors, or it may be on the center console/arm rest door.
The choices for '96 were:
2.59
3.07
3.45
You'll need to check your RPO code decal to determine which one you have. The decal should be on one of the rear compartment doors, or it may be on the center console/arm rest door.
Joel Adams 
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
I have the performance ratio also on my 96 and it is 3.07
Happy Holidays!!!
Standard Member
Send PM
Orange Park, FL - USA
Joined: 12/4/2009
Posts: 56
Vette(s): 1996 LT4 Blk/Blk coupe all origional
I may have missed it but didn't notice what trans you have. My '96 LT4 with ZF 6sp is a 3.45 and on the build sheet this is listed as a GM3. I have many ref books at home (spending holidays in the Philippines with in-laws where it is 90deg.
) and would be glad to look it up for you.
) and would be glad to look it up for you.
I have a question for everyone too..I've seen numerous ref's to a G92 performance option and have never found what the ratio is . Does anyone know?
Yeah, the G92 RPO is a 3:07 to 1 ratio. I believe it was used only in conjunction with the manual ZF giving an additional 5 horse power, from 240 for the automatic to 245 for the ZF. I know the ratio is right but I stand to be corrected on the rest of my claim.
Standard Member
Send PM
Bandera, TX - USA
Joined: 1/4/2012
Posts: 28
Vette(s): one ea. 1996 LT1, red on gray interior, stroker 383 Dart heads w/ 2.02"int,1.60exeh 11.8:1, Comp Cam 230/236@50 .570/.576 113LSA , Crane 1.6:1`rocker arms, GM Delphi roller lifters HiFlo Cats, Xpipe and low restriction muffles, it sounds lumpy at idle!!!
I just looked this up you have 3.07:1 in the punkin.
The RPO codes at this site will show you what you have
G92 is a performance rear axle, G44 is a 3.07 anyhow some of these codes are redundant
in Forum: C4 Driveline Components
SPONSOR AD: (Our Sponsors help support C4VR)