Hey,

This spring I will be draining my rear end and adding synthetic gear oil, posi additive...

I called my local GM Dealer and asked for a rear end gasket...his question to me was:

What size? 7.75" or 7.625" ??

I told him I had the 3.27 9-Bolt Borg & Warner rear but that never helped him... he said he showed two part numbers.. the 7.75" and the 7.625"

How am I going to find out what size mine is?

 

The 9 bolt is a 7.75. How much did they want for the 7.75 gasket?

 

Don't waste your money at the dealer on any of that. Use the "tubular style" gasket.

 

What exactly is a "tubular gasket"???

 

It is called RTV gasket maker, and it comes in a tube that you squeeze it out of...
Lots cheaper than a gasket, and much easier to scrape off when you have to service the rear again.

 

well i guess i'll disagree with rb on this one, i prefer to use a gasket and not RTV. i even use the china wall gaskets.

 

I am not 100% on this one, but I don't think that there is any gaskets for the 9 bolt readily available. You could always make one, but a good gasket silicone will work just as well if not better. Just do not apply too liberally, and createwads of silicone inside the diff housing!

 

There are now readily available. I will be adding to my page later this week along with a bunch of other 9 bolt parts.

Miles
www.9bolt.com

 

lol, at dealerships like where i work we use both, the sealer usually lasts longer if it is cleaned up well:lala: