89 Iroc Z

According to this tech article:
https://www.thirdgen.org/newdesign/tech/brakes2.shtml
All you need to mount the 89-92 rear disk brakes on a drum rear is these to brakes:

#10136853-LH mounting plate(1)(10 bolt)
#10136854-RH mounting plate(1)(10 bolt)

Can anyone confirm this? And where would I buy these brakes? How much do they cost?

Apeiron

They're cheap, but you won't be able to just bolt them on. The axle flanges on the drum rear are different from those on the disc rear.

89 Iroc Z

How hard would it be to make them fit. What has to be modified on them so i can bolt them up?

Apeiron

You'll have to make this:
<img src="http://members.home.com/crussel/drum.gif">
look like this"
<img src="http://members.home.com/crussel/disc.gif">

STUB25

What is that picture of? I just did a rearend swap in my 89 RS. I went from drum to disc and also to a posi w/ 327 out of a 88 camaro. I had 96 PBR calipers at hand so i got the correct backing plates. The plate in the pic was not an issue for me? What is you response to this? Did I make a bobo here or what??? Help me out

89 Iroc Z

What drum rear did you convert? How did you convert it? Where do I buy the brackets?

Apeiron

Those are the axle flanges on 10 bolt drum and disc rear ends.

ANDYZ28

The pictures are what the end of the axle housing looks like where the backing plate attaches to. The drum brake axle housings are different than the disc brake axle housings. So in order to install the disc brake setup on a drum brake axle housing. You must modify the end of the axle housing to accept the disc brake backing plate.

Thanx,ANDYZ28

paul_huryk

Baer makes kits for both a drum rear and the disc rear. They use different backing plates that adapt the PBR calipers and 11.65" rotors. They have the only decently easy way of accomplishing the project. The kit runs about $700 or so complete.

FYI:
You will need to pull the axles and do other more technical things. If you can't do that, please take it to a shop that can. You reassemble the assembly wrong you will kill the brakes and the rear.

ANDYZ28

Many of us are trying to do this conversion with stock parts. I anm not going to pay $700.00 for a rear brake conversion.

Spifz

If you don't want to pay, then you will need some fabrication skills. If you don't have skills, then you will need a case of beer. This will drastically help convince your friend with skills to help you. You could spend an afternoon and $10 worth of steel, welding plates all over the place until you have the 4 holes in the correct place to bolt your discs on. Fun. A better alternative would be to go to Moser Engineering and spend $75 for correct, good housing ends. Then cut your housing ends off. and MIG the new puppies on. I've done it with a hacksaw, and with a little care (and some help from the gauge you have to set ring gear play...) you can make it more parallel than it came from the factory.

Some of these rotating parts (brakes, axles, crankshaft...) require money to upgrade. No one asks, "How can I cut my crankshaft apart and weld in an extra .25" of stroke?!" Brakes should be considered the same.

ANDYZ28

If you say so.

Spifz

I guess the fact that I only have 9 posts means I don't have a lot of experience

oh well, just trying to help, had to have discs on the back too.

ANDYZ28

I did my 1LE front brake upgrade without any welding or precision fabrication skills. The rear upgrade can also be done without any precision fabrication skills and certainly without any welding. I am going to do just that. Then share my skills and pictures with everyone.

But I do appreciate your opinion.