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Rear pinion seal leak/ removal

 
Old 04-21-2019, 02:02 PM
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nestor
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Default Rear pinion seal leak/ removal

I had my rear diff rebuilt by a shop 2 years ago and I have a leak now.I was going to replace seal but I can not remove the pinion flange nut. Is the nut pinned or locked in some manner?

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Old 04-22-2019, 12:24 PM
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The videos i see show a lockvwasher and when they take it off it usually requires a breaker bar. You may want to wait for a post by someone thats done it or call Willcox
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Old 04-22-2019, 12:33 PM
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GTR1999
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You don't mention what year it is, assuming it is a 63-79 iron diff there is just a locknut, thick flat washer and the yoke. If the splines were not sealed it will leak new seal or not. Looking back this was a problem you had 2-3 years? Was it repaired then and failed again? Any competent shop can replace the seal and correctly keep the preload in place.
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Old 04-22-2019, 05:21 PM
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I tried removing the nut with a breaker bar and then with impact gun. It did not budge.
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Old 04-23-2019, 06:43 AM
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GTR1999
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There may be Loctite on the nut, hit with propane to get to 400*F that will break the bond and the impact will remove it.
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Old 04-25-2019, 12:49 AM
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Thanks for the replies. I was hoping not to use a torch. Tight space to heat with a torch but it did the trick. When I took the flange off I found a speedy sleeve still in the seal. It appears to have been leaking between sleeve and flange. After removing seal, I put the three back together. When I turn the flange it rotates inside the sleeve. There are wear marks on the inside surface of the sleeve. Do you think I should just buy a new flange or try a new speedy sleeve?
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Old 04-25-2019, 06:54 AM
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I have used plenty of sleeve without an issue, they were all tight on the pinion and I use Loctite on them. Sounds like the yoke is undersize, I think I would replace it since I have a box of them on my shelf. Not sure what year you have but it should be either a 1310 or 1330 yoke. If you don't know which one it is just look at it. If the joint is retained by u-bolts it is a 1310, straps = 1330
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Old 04-25-2019, 09:55 AM
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1969 427 in avatar pic I just added. I measured the yoke I am getting 1.738" in without the sleeve and 1.859" with sleeve( Dennys Driveshaft has the yoke at 1.740") There is a groove worn on both the sleeve and yoke. It is a 1310 30 spline. I also noticed the old seal did not have spring on it and new one does.

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Old 04-25-2019, 11:23 AM
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Well that seal doesn't sound right, all the seals I use and have for years are CR/SKF and all have the spring on the back. You should pack it with grease to keep it in place when you tap it in. The sleeve should be tap fit on the yoke, if it slides on then replace the yoke. New 1310 yokes are available for about $100-$120. I have plenty of 1330 but my 1310 inventory is low. Use a good sealer on the splines, I now use Permashield and have for years without issue. You have to follow the instructions to detail to use it.
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