engine and drivetrain 3.91Lsd Diff -- Which Rear Gasket?

[bnam]

Which part/number should I look for when refreshing the gasket of the 3.91LSD that's on my 74Tii?  Wasn't successful with search.  I think it is the '02 gasket, but want to confirm.

 

Also, what's involved in replacing it?  Unbolt rear hanger from car and diff and remove cover?  Or is there more to it?

 

I have a very slight leak (a drop every few weeks) -- part of me says leave it alone, but another voice says fix it.

B

[williamggruff]

Personally, I've never used a gasket.  I've simply cleaned up the mating surfaces, and used RTV to seal the diff cover onto the housing.  Never had any leak issues, including 3 seasons of endurance racing.

[BLUNT]

33113604117 if you decide to use a gasket

[M3M3M3]

no rear gasket. see my how to article on swapping diffs in the articles section of the faq.

[TobyB]

Mine comes in a tube that says Permatex Ultra Black...

 

t

[bnam]

Just read thru the article.  Thanks!  Based on the pics, it doesn't look like there will be enough clearance to torque the upper two bolts on the rear cover with the diff on the car.  Looks like I would need to take the diff off to do it right?  Or, that not the case?

 

Is the plug washer the same size as the engine oil pan drain washer?

 

B

[M3M3M3]

i have never done it on the car, i always take the diff out.  well, i am always swapping diffs so a couple are out all the time...

 

no, plug crush washer(S) are not the same size as oil pan. (EDIT - NOT 100% correct! see Steve's reply below!)  they are bigger.   realoem will have the sizes.

 

 

 

Mine comes in a tube that says Permatex Ultra Black...

 

ditto!

Edited January 23, 2014 by mlytle

[BLUNT]

Just read thru the article.  Thanks!  Based on the pics, it doesn't look like there will be enough clearance to torque the upper two bolts on the rear cover with the diff on the car.  Looks like I would need to take the diff off to do it right?  Or, that not the case?

 

Is the plug washer the same size as the engine oil pan drain washer?

 

B

07119963355 is the crush washer and it is actually the same size as the oil pan assuming you have the 22mm drain plug...  there is a 22mm and a 12mm

[M3M3M3]

thank you Steve. apparently all the 02's i have had oil pans that were 12mm. didn't know there was a big'un! i stand corrected!

Edited January 24, 2014 by mlytle

[jgerock]

07119963355 is the crush washer and it is actually the same size as the oil pan assuming you have the 22mm drain plug...  there is a 22mm and a 12mm

 

Likewise- the 2002 covers I have all use the larger washer (same as engine oil pan).