I just bought a 90' 10 bolt disc brake rearend to replace my stock B/W 9 bolt 87' disc brake rearend . Is there any major differences in them ? Are the calipers and rotors the same ?


Thanks

 

They are completely, altogether different. Absolutely nothing whatsoever interchanges.

You are taking off the crappy ones, and putting on the good ones. Be grateful that you don't have to re-use anything of the old ones.

 

Does anyone know the part #'s for new calipers and rotors ?


Thanks

 

For the '90 10 bolt? Why are you replacing the calipers? In any case, just go to Auto Zone and get rebuilt ones if you must replace them. GM will charge you your first born for factory parts.


Ed

 

It did not come with the calipers when I bought it. Somehow when the shop installed it they use the old calipers from my B/W 9 bolt. Is there a saftey issue here ?


Thanks

 

OH yeah...WOW!! Never heard of that swap before. First off, the backing plates for the 9 and 10 bolts are different, and the way the calipers mount are different.

Click the link in my sig and look at my rearend install page. I have pics of my (old) '88 disc rear and my swapped in '89 PBR disc rear. You shold be able to tell a difference in them. The PBR calipers (for your 10 bolt) sit in a type of cradle. The older disc calipers (from your '87) bolt directly onto the backing plate.

I really want to see how they installed that thing. Can you post a few pics? Does the setup work? Let me ask this...are you SURE you got a '90 10 bolt disc rear and not a pre-'88 disc rear? I ask this because you're still a newbie so I'm not trying to insult you.

Ed

 

Yea i'm sure its a 90' 10 bolt. Before I bought it I wrote down the #'s on it to make sure it was a posi. Started with a P.... when I ordered 373's for it I ordered them for a 10 bolt. no digital cam to take pic , and the car is at the shop getting an LT1 installed. I'll call them and ask them to jack it up and take a look. Did they make a 10 bolt In the 80's ?

thanks

 

My 78 El Camino has a 7½" 10-bolt in it. It won't fit in a Camaro, but the guts (gears, carrier, bearings) will go in a Camaro 10-bolt housing, because it's the same model. A 82 Camaro or Firebird 10-bolt will bolt directly into any Camaro or Firebird from 82 to the present.

Pics would tell the tale. Either the rear you have isn't a 90 model, even though it may have been removed from a 90 car; or something. There's no possible way to just install 90 model brakes on the earlier rear.

 

I went and looked a little closer at my 90' rearend and discovered that the rearend is a 90's style type with the larger rotors and nicer aluminum caliper setup. The code I found was 6PM, which was posi with 3.23's.

I'll be going to see an eye doctor in the morning :-) Thanks to all that replied..........

 

Congrats my man..you are hooked up.

Ed

 

when i got my new rear end from an 88 formula, i put in the 89 style brakes on it (both 9 bolts BTW). i don't see why the reverse wouldn't be possible, if you were uneducated enough to do it. all you need to do is swap the plate the calipers sit on, although that does require removing the axles, which is a snap on a 9-bolt. just saying for agument's sake.

 

Now to do something about the front. Looks kinda funny with the rear rotors being larger that the front, it's supposed to be the other way around. 1LE maybe ?