G80 vs G92
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From: Western Maryland
Car: 82z28
Engine: 406
Transmission: th350
Axle/Gears: 3.23
performance gears are usually referred to as the (3.42&3.73) gearsets in these cars....this gives you more torque increase (acceleration)
while with 2.73's your cruise rpm's will be lower and top speed(theoretically would be higher)
while with 2.73's your cruise rpm's will be lower and top speed(theoretically would be higher)
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
G92 does not call out for a "specific" ratio, even in the same year; it depends on what car it's being applied to. It's always a higher number (better acceleration at the possible expense of gas mileage) than the "base model" setup. Needless to say, the factory was VERY STINGY about doling it out, given the importance of CAFE.
For example, in some years, it was 3.42 for a TPI 305 5-speed instead of 3.23, and 3.23 for a TPI 350 auto instead of 2.73.
For example, in some years, it was 3.42 for a TPI 305 5-speed instead of 3.23, and 3.23 for a TPI 350 auto instead of 2.73.
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From: Tampa, Florida
Car: 1987 Chevrolet Camaro Z28 IROCZ
Engine: L98 350, mini ramed and camed
Transmission: T56 6 speed manual
Axle/Gears: 10 bolt 3:73 limited slip
Mine is a 87 roc with the L98. It came with the G80 and J65. Which ment posi and rear disc. But when you add the L98, disc and the posi together it gave you the G92. So mine allready came with the 3:27's standerd. I found this info on the site for 87 year. Adam :-)
G92 (performance axle ratio) available only on IROC-Z with 5.0 TPI (LB9). G92 was available on IROC-Z convertible in 1987. All 1987 350 TPI (B2L) IROC-Z's came standard with the 3.27 BW rear end and everything that was included with G92 but did not have the G92 RPO code because it was mandatory; this changed in 1988 however when a 2.77 BW rear was standard and G92 had to be specified to get the 3.27. All 1987 350 TPI (B2L) IROC-Z's required J65 rear disc brakes, G80 limited slip differential, and KC4 engine oil cooler.
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From: Beaufort South Carolina
Car: 1983 Camaro Z/28
Engine: LU5 305 CFI
Transmission: 700R4
Axle/Gears: J65/G80/G92-3.23
Time does your RPO list J65?To go from the other direction the J65 4 wheel discs required the G80(and when ordered on a Sport Coupe,RS,Berlinetta or LT you had to order the 305).For my '83 the G92 gear is 3.23-LU5/Auto combo(she also has the G80 posi and J65 discs).Like sofakingdom states G92 varied from year to year and depended on what engine was ordered.
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From: Tampa, Florida
Car: 1987 Chevrolet Camaro Z28 IROCZ
Engine: L98 350, mini ramed and camed
Transmission: T56 6 speed manual
Axle/Gears: 10 bolt 3:73 limited slip
Ok. You have a you have a posi(G80) with rear disc(J65) and the performce gear 3:23(G92) insted of the standered 2:73 that you would of got with out having G92. So basicly it list like this.
G80= you get a posi
G92= you get the lower gear ratio of 3:23
J65= rear disc
So you have a very good equeiped rear. Hope that helps. Adam :-)
G80= you get a posi
G92= you get the lower gear ratio of 3:23
J65= rear disc
So you have a very good equeiped rear. Hope that helps. Adam :-)
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From: Beaufort South Carolina
Car: 1983 Camaro Z/28
Engine: LU5 305 CFI
Transmission: 700R4
Axle/Gears: J65/G80/G92-3.23
I agree with charlie.From your RPO list you have all the go-fast and comfort goodies.It's interesting that both RPO's for the 350 are listed - B2L & L98(or does L98 mean this motor has the Vette's aluminum heads - sorry for the off topic question).
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From: Crandall,Texas
Originally posted by coolram62
I agree with charlie.From your RPO list you have all the go-fast and comfort goodies.It's interesting that both RPO's for the 350 are listed - B2L & L98(or does L98 mean this motor has the Vette's aluminum heads - sorry for the off topic question).
I agree with charlie.From your RPO list you have all the go-fast and comfort goodies.It's interesting that both RPO's for the 350 are listed - B2L & L98(or does L98 mean this motor has the Vette's aluminum heads - sorry for the off topic question).
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From: Tampa, Florida
Car: 1987 Chevrolet Camaro Z28 IROCZ
Engine: L98 350, mini ramed and camed
Transmission: T56 6 speed manual
Axle/Gears: 10 bolt 3:73 limited slip
Originally posted by Time
I wouldnt think any 3rd gen Z28's came with aluminum heads.......did they?
I wouldnt think any 3rd gen Z28's came with aluminum heads.......did they?
And for B2L and L98.
B2L= PERFORMANCE PACKAGE & ENGINE PACKAGE V8 5.7LPFI
L98= 5.7-LITER V8 TPI ENGINE
That's what I got for mine when I read the codes. Adam :-)
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From: Beaufort South Carolina
Car: 1983 Camaro Z/28
Engine: LU5 305 CFI
Transmission: 700R4
Axle/Gears: J65/G80/G92-3.23
Thankyou Charlie,and Time for shedding light on it.The RPO B2L is the complete pkg then and L98 is listed because that's the separate RPO for the motor itself.Kind of like the "1S" pkgs that combined options.
Iron heads almost call for a hoist by themselves.Ever pickup a set of BB heads?
Iron heads almost call for a hoist by themselves.Ever pickup a set of BB heads?
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