Rear Differential

Jon · Post by **Jon** » Sun Oct 15, 2006 2:56 pm

It appears my Rear Differential (1978, but it's an early model) is leaking some type of lubricant out of the bottom. What's supposed to go in there and how do I get it to stop leaking? I don't have the owner's manual and am unfamiliar with working on the differential!

racydave · Post by **racydave** » Sun Oct 15, 2006 7:08 pm

Less than 2 quarts of 80w90 EP oil, to be serviced every 30K. You should ck and adj fluid level( is to bottom of fill hole) clean it up, drive and recheck, it may not be as bad as it looks, and probably from the pinion seal.

mbouse · Post by **mbouse** » Sun Oct 15, 2006 9:04 pm

Eventually, whether it is one drop per week or one drop per minute, if you do not address the issue of leaking lubrication.....your differential will run dry. Before it is completely out of gear oil, you will have some big trouble.

Changing the differential gasket is not a big deal, if that is where it is leakig from. Two hours tops, and under $10 including oil.

A manual is a great thing to have. I prefer the Brooklands. I think all of our major suppliers carry a couple of brands each. You should seriously look into one.

Warpigs446 · Post by **Warpigs446** » Mon Feb 20, 2012 11:42 am

Question, I changed out the differential gasket, and now it's leaking worse then before I changed, should I have put a liquid gasket on the bolt threads?? Also, the gasket I purchased was from IAP.

narfire · Post by **narfire** » Mon Feb 20, 2012 4:19 pm

Warpigs446 wrote: I changed out the differential gasket, and now it's leaking worse then before I changed

Mine did the same. I drained and re-sealed and bolted back together but I let it sit for a couple of hours before I filled it back up. I have no idea if that is/was normal protocol, but its not leaking now. I used a blue sealant with the gasket. The surfaces were clean and wiped with a rag with brake cleaner and let dry for a few minutes.

RRoller123 · Post by **RRoller123** » Mon Feb 20, 2012 7:15 pm

We (my mechanic) took off the cover and inspected and cleaned and reinstalled with liquid gasket only. No problems whatsoever.

Warpigs446 · Post by **Warpigs446** » Tue Feb 21, 2012 7:56 pm

It's going to be a few weeks before I get back to it, I will give it a try and go with the first one that works, I'll provide an update when completed!! Thanks for the help!!!!

Warpigs446 · Post by **Warpigs446** » Mon Mar 12, 2012 9:33 pm

Well I drained the differentail, cleaned it up, and used a liquid gasket, let it cure over night 24 hours and refilled it, no leaks, thanks for the advise it worked!!!

aj81spider · Post by **aj81spider** » Mon Mar 12, 2012 9:43 pm

I'm new to this, but what is a liquid gasket? Is it spread on the regular gasket or does it replace it?

What would you ask for in the auto parts store?

Thanks for educating a novice.

RRoller123 · Post by **RRoller123** » Tue Mar 13, 2012 3:55 pm

I don't know a brand, (my mechanic did the work on this topic) but it replaces a fibrous mechanical gasket. It is brushed on the clean surfaces, sets up awhile, then reassemble and seals very well. No problems so far.

124JOE · Post by **124JOE** » Tue Mar 13, 2012 4:10 pm

i have not done any diff seal yet
but i swear buy permatex black RTV gasket maker silicone
i find it at autozone and most parts stores

Rear Differential

Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential

Re: Rear Differential