I know this may sound stupid but I have an 89 iroc with the borg 9 rear and it's limited slip 2.77 only one tire pulls until you start doing figure 8s both will eventually turn though.. iam wanting posi and 3.73 gears atleast and the 9 inch parts are just too high, when I have a 10 bolt posi with 373 gears that came out of an 88 iroc just sitting.. my question is will it fit the 89 I know the disc brakes want work that's why i was gonna keep the drum brakes until I can buy the disc brake kit for the 10 bolt.. can any one help???

 

An 88 wouldn't have been originally equipped with 3.73's, unless it was swapped in of course, so you might verify what you have.

JamesC

 

What iam wanting to know is will the drum on the 10 bolt work on the 89 it's currently 9bolt disc brakes

 

IIRC, the axle flange on a drum rear is different from a disc brake rear end, so the swap would require a major effort.

JamesC

 

Could I just bolt the hole 10bolt rear end up drum and all will the brake lines that are on it work

 

I believe the lines and ebrake cables are different

 

So I should get 10 bolt lines and cable

 

on the 10 bolt drum rear, You can cut the top off of the drum brake bracket, drill 2 new upper holes using the disc rear brake bracket, enlarge the bottom 2, do some more small things and the whole disc setup will pretty much swap over fairly easy. If you do it right, you won't need to break open the brake lines or unhook the E brake cables. You will have to remove the axles from both rearends.

 

Have you done this..sounds good

 

Yes, should be a few threads on how to do it if you google it or try your luck with this sites search feature

 

All I can find is 10 bolt disc brake conversion. Not 9 disc brakes to 10bolt conversion

 

They work the same.

 

Or you could just buy the conversion brackets..
This should help as well
https://www.thirdgen.org/forums/brak...drum-rear.html