I think it will but just to double check will a rear from an 88 iroc z (drum posi) bolt up to a 90 camaro rs

Yes. More swap info that you should consider below:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

Ok the rear is said to be posi drum with 2.73 gears from an iroc z would it be a good idea to change the gears

For the cost to change the gears, you could just get a rear with the gears you want.

Well easier said then done I've looked everywhere been looking for a posi disc off a 90 to 92 but no luck

Perhaps because of current prices in gasoline, you might consider highway gears like the 2.73's, but personally, I wouldn't want anything less than 3.23's. As Camaronebie mentions, find a rear with the gears (and brakes) you want. Remember too that there is the fourthgen option.

JamesC

Same here as far as 3.23 but I don't care about gas prices just want what I want but can't find it

Yeah, I understand that. If you haven't already, you might get aggressive and post in our site's classifieds and craigslist, call/visit boneyards or swap meets. I saw an 89 IROC roller with rear discs and PBR's just yesterday at Lawrence's swap meet, so they are out there. Good luck with the hunt.

BTW, what's under your 92 now?

JamesC

It's a 90rs drum non posi sorry I didn't specify I just posted in parts wanted im always on craigslist and nothing coming up in and around new york

I just bought a 9 bolt posi with 373 gears for my 87 IROC. I was a little weary of going with a 9 bolt considering I have a 10 bolt 273. But its the ratio I want and all I have to do is swap. So Im going for it! The question is, the new rear (9 bolt) has drum brakes. Has anyone ever seen this on a borg warner? Im not too concerned because I have drum now, but is there any things I sould look for or pay special attention to when doing the swap? Any advice would be helpful

Since 3.73 is a 10-bolt gearing, are you sure it's a 9-bolt? IIRC, some early model cars were equipped with 9-bolts and drums. Further 9-bolt info here:

https://www.thirdgen.org/forums/faq-...now-about.html

JamesC

Upon further expection today I discoverd the rear I actually have bought has a 3.27 gear ratio. Im still going to install it and see how the car reacts. Im hoping for some improvement. As I understand it, this rear has a 3 series carier which means I can go lower on the ring and pinion gearing. Im happy to know some of them had drums and not a conversion I was worried about that. Is that 150 dollar ta cover worth the money? I cant seem to find a chrome one.

I just picked up a 10 bolt 3.23 posi w/ disc brakes out of a 90 IrocZ off Craigslist for $200 delivered. The car was in a front end accident and had less the 100k miles.
I plan to rebuild the brakes, replace the wheel bearings, clean it up, paint it and install it next winter when I rebuild the rear suspension.
I was hoping to find one with 3.42 gears but couldn't pass on the price.

Will a 9 bolt that had disc brakes allow drum brakes to be installed?

I am looking to get a sweet deal on a 3.27 9bolt to replace the 2.73 10bolt in my car right now. The 9bolt has had the discs removed, and i'm fine with using drum brakes.

No. The axle flange is different.

JamesC