9 bolt disc brakes swap

[cars44tars]

OK Guys... I need help please. I have a 88 Iroc with the Borg-Warner axle with disc brakes. Can i swap the disc brakes from the 9 bolt to 2004 10 bolt exle??? My Borg-Warner rear axle is makeing a woring noise when driveing. I have checked the gear oil to find the oil was leaking out and had a very small amount of oil left in it. So i fix the leak and put in new oil plus the additive for Possy track rear ends. I just got the car and fixing the bugs out of it. The 10 bolt rear end was bought from F-Bodys in Charrlott, NC. I believe they told me the 10 bolt was out of a 2004 Formla Firebid, but it haves the DRUM BRAKES. So I thought to go ahead and swap rear ends out and put the disc brakes on. Am I makeing the right choise?????? Also... what is so specail about the Borg Warner rear ends?????

[JamesC]

Welcome to TGO.

You can't swap the disc to a drum rear without modification or Ed Miller's kit. Remember too that you'll need a disc proportioning valve, e-brake cables, and driven and/or driven gears to make the speedo rear correctly.

BTW, the flanges/backing plates are different between 9- and 10-bolts. Nine-bolt are a bit stronger, but parts are apparently difficult to come by. The following FAQ will provide more info on 10-bolts:

http://www.thirdgen.org/techboard/tr...-10-bolts.html (FAQ About 10-Bolts)

JamesC

[jv9999]

Also the 4th gen rear is wider (but it will bolt in). Sounds like your 9 bolt needs a bearing kit. Might be easier in the long run to fix it.

[InfernalVortex]

Originally Posted by JamesC

BTW, the flanges/backing plates are between 9- and 10-bolts. Nine-bolt are a bit stronger, but parts are apparently difficult to come by.

Can you explain this a little better? Im not sure what you mean.

[JamesC]

Originally Posted by InfernalVortex

Can you explain this a little better? Im not sure what you mean.

Oops, my bad. Nine- and ten-bolt backing plates aren't interchangeable; the bolt pattern is different.

JamesC