I just bought a 9 bolt posi disc rear out of a 1987 Trans Am. I am swapping it into my 1985 IROC (also a disc rear, but not posi). Please tell me what differences there are in bolting this rear in such as brakes, emergency brake cables etc. Is this literally a direct swap or is there anything I should be aware of. I want to know upfront what I may run into rather than discovering in the middle of the swap. Anyone who has done this, I would appreciate hearing what your experience was like.

 

I am about the do the same thing. I just got a 9bolt out of a 88 ws6 for free!!! So I am pretty stoked. Aparently everything bolts right up. Or at least looks that way. I won't know until I bolt it up. Good luck

 

should be a direct swap. If you're right on the years, then the only thing I'm not sure of is whether or not 85's have the later metric brake lines or not. I believe so, but not sure.

An 89 9-bolt would have different brakes, but as long as you have everything from it you would be fine.

do a search, others have done this before, so you'll find more info searching than posting.

 

Thanks for the input. Bill

 

Only the 82-83 cars and maybe a rare few 84s have SAE brake fittings. The rest are all metric.

 

Sweet! Thanks for the info.

Bill

 

Im looking for someone that Knows of a company that sells replacement gears for the old 9 bolt, i blew the original 3:70 gears and have 3 :20somthings in there now. I rember somone posting about some company.

 

Yeah I looking to for a place to buy rebuild kits from. Hopefully someone knows.

 

Reider Racing and Randy's Ring and Pinion both carry the 3.70 replacement gears for nine bolts.

 

Sweet thanks for the info

 

I might actually keep my 9-bolt now

 

Hell yeah I am really looking forward to doing the swap