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February 1, 2021 5:57 am  #1

9" Rear End Leak

I just filled my 9" rear end on my project car a few weeks ago, and I noticed a small puddle of oil under it yesterday. It's leaking at the 3rd member connection. Is there a gasket between there that I might need to replace or something? The car doesn't run or drive yet, it's just been sitting there.


February 2, 2021 12:34 pm  #2

Re: 9" Rear End Leak

There is a gasket that goes between the third member and the housing and any auto parts store should have one, however I prefer RTV.  Pull the pumpkin, clean both mating surfaces then cote the pumpkin surface with a thin layer of RTV.  Reinstall the third member and tighten it down a little at a time adding a small amount to each nut, working your way around the differential.  After 3 or 4 trips around it should be tight.  Give it at least an hour to cure before adding fluid.


February 2, 2021 8:39 pm  #3

Re: 9" Rear End Leak

Thank you 👍

     Thread Starter

February 3, 2021 6:50 am  #4

Re: 9" Rear End Leak

It's always a good idea to replace the copper washers on the studs.


February 3, 2021 7:15 am  #5

Re: 9" Rear End Leak

I'll remember that 👍

     Thread Starter

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