I have an '88 Formula LB9/T-5 with 3.45 gears and the 140MPH speedo. I have the codes GM3,G80 and J65 but not G92. My understanding is that G92 for '88 would have been the performance axle ratio, which GM3 already gave me. I know in later years it included other things. I have searched the board/archives and not found a clear answer. So my quesion is what would G92 have given my '88 bird i don't have ?

 

If you have all the other RPO"s and G92 is not listed, my guess is you don't have it.

 

Do you have KC4?

 

For the later birds the G92 came in a package...the RPO was RP6 or R6P i cant remember...it included the gears exhaust 4 wheel disc and the oil cooler....although all those rpos are listed..

 

What did G92 include in '88 tho ?

 

If you have the 3.45 rear, then the bottom of your differential housing would be embossed with Borg Warner 4EW. If not, then 4EU is a 3.27, and 4ET is 2.77. Crawl under and have a look.

It's been a looooong time, lol, but I don't think anything else was included with G92, just the performance ratio(maybe speedo). I believe all other suspension upgrades were part of the WS6 option. But I'm just going from memory, lol.

 

 

Sice his car is a 305TPI 5 speed he cannot have the 3.27 or the 2.77s--those were on 350TPI cars only

 

If he actually has the G92. But he said his RPOs don't have it, but he's sure he does have it. So I just offered that as a way for him to confirm his G92. The G92 will be the 4EW. If it's one of the others, then he's only got posi, but no performance ratio.

 

I do have GM3 .....


GM3 : AXLE REAR, 3.45 RATIO

 

My 87 is the same way, It has all the performance options, (except for the KC4 Oil Cooler) But no G92... I am thinking that it might be a Camaro only option in the early years.

John