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Differential Leaking

1035 Views 3 Replies 4 Participants Last post by  black gold man
Hello All,

After a few light autocross runs today I noticed that my differential was leaking pretty badly, clouds of smoke from the diff oil dripping onto the exhaust.

I've noticed the leak before (a couple drops on the driveway after a long drive) though I didnt know exactly where it was coming from. Now its pretty clear its coming from where the driver side half-shaft is inserted. How easy of a job is replacing that seal?

Also, I noticed that each halfshaft can slide more than half an inch in and out of the diff. While I expect movement, that seemed excessive... Is it?

Diff oil, I know its GL5, is 75-90 okay?

I was thinking of doing the work when I dropped the diff out to replace the mounts, and just filling up the fluid now and then in the meantime, any problems I might run into there?


Thanks a ton guys,
Ricky
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RickO5 said:
Now its pretty clear its coming from where the driver side half-shaft is inserted. How easy of a job is replacing that seal?
Most of the effort is in halfshaft removal. The seals are simple enough once the halfshafts are out.

Also, I noticed that each halfshaft can slide more than half an inch in and out of the diff. While I expect movement, that seemed excessive... Is it?
Quite excessive. I wonder how much of the retaining circlips are left, if any.
I have seen some quite worn and thin circlips. While the halfshafts are out, check how freely the sliding joints move.

Diff oil, I know its GL5, is 75-90 okay?
Good enough.

I was thinking of doing the work when I dropped the diff out to replace the mounts, and just filling up the fluid now and then in the meantime, any problems I might run into there?
Considering the dubious attachment of the halfshafts in the diff, I would be driving like a granny until rectified.
I was thinking of doing the work when I dropped the diff out to replace the mounts
Is your current mount toast? Reason I ask is that if the differential is moving that may have unseated the axles. If there is a gap where it connects to the diff of about 1/2" and if it moves it is not seated. If so jack up remove wheels and try to seat it. It takes a little back and forth force to do it. Don't pull them to much towards the wheels as you will dislodge the outer grease seal. Found out this the hard way. If it doesn't seat then it prob is the circlips mentioned above. Also you don't have to remove diff to replace mount. Look at the FSM. I just installed this one http://z31parts.com/polyparts.html. Based on its construction I would doubt that it would ever fail. If you use it go to Napa and get their moly/graphite lithium lub and lub the heck out of it.
Is there a vent on top of the 84 rear end. If i drive my 78 hard it will send a little
oil out the vent and i will have drip when parked.
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