hey guys i have a 1990 iroc l98 factory car with a t56 i really dont know what my rearend is it is stamped borg warner. but in 90 didnt they stop using borg warner?? anyways to get to the point i have installed an t56 in my car and i need a gear bad i want a 410 or 411. does anyone know what size my rearend is and can i buy a ring and pinion? what size do i need or do i need to find a 10 bolt out of a v6 car and build it to my needs . some help would be appreicated

 

Count the bolts on the cover.

 

what will that tell me
thanx

 

Whether you have a 9 bolt or a 10 bolt rear.

 

They did put the 9 bolt in a few of the 90 car until they used up the remaining stock. If you have a 9 bolt then you gear selection is basically limited to stock gear or 3.70. It's very difficult to locate anything higher than a 3.70.

 

my '90 IROC with L98 5.7L has the 9-bolt Borg-Warner rear-end with disc brakes. the tag on the 9-bolt diff cover indicates 3.27 gears.

ring gear size is 7.75"

I think they were used in 1991 also.

 

so my ring gear is 7.75 in size i looked at my i.d tag and it says i have 3.27.i want a 4.10 for my car with my t56 so i geuss i need to be finding a 10 bolt ..