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Rear diff pinion seal
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=78979		 Page 1 of 1
Author:  dirtmover [ Thu May 01, 2014 9:17 am ]
Post subject:  Rear diff pinion seal
I notice it's leaking a little bit and I thought I'd replace it when I swap out the U-joints. Is this seal prone to failure or is it a sign of other issues.
Author:  tjkj2002 [ Thu May 01, 2014 9:20 am ]
Post subject:  Re: Rear diff pinion seal
Prone to leaking if using synthetic gear oil.Swap out the gear oil for non-syn 85w-140,clean area well,and monitor as it may seal itself up again if it's just starting to seep a little.
Author:  dirtmover [ Thu May 01, 2014 9:29 am ]
Post subject:  Re: Rear diff pinion seal
Thanks, I'll give that a try first. It's due a change anyway and most of my towing is pretty light duty nowadays.
Author:  thermorex [ Thu May 01, 2014 10:32 am ]
Post subject:  Re: Rear diff pinion seal
tjkj2002 wrote:
Prone to leaking if using synthetic gear oil.Swap out the gear oil for non-syn 85w-140,clean area well,and monitor as it may seal itself up again if it's just starting to seep a little.


Once again, right on! I had the same exact issue, and I ended up replacing the seal and get Lucas 85w140 non synthetic. Seal is about 20 at Napa and Lucas is about 8/bottle at advance auto, without coupons. Dirtmover, I'd say replace the seal too, you are almost there anyways, it's just another nut you have to remove for the yoke.
Author:  dirtmover [ Thu May 01, 2014 12:56 pm ]
Post subject:  Re: Rear diff pinion seal
My concern with changing the seal is torquing back up against the crush sleeve. The procedure I've seen involves removing the wheels and calipers and measuring the turning torque using a beam type torque wrench which I don't own. Maybe there's simpler process which I should be following?
Author:  tjkj2002 [ Thu May 01, 2014 1:45 pm ]
Post subject:  Re: Rear diff pinion seal
dirtmover wrote:
My concern with changing the seal is torquing back up against the crush sleeve. The procedure I've seen involves removing the wheels and calipers and measuring the turning torque using a beam type torque wrench which I don't own. Maybe there's simpler process which I should be following?

Doing it the correct way(using the beam torque wrench) is the only way to insure the proper torque and not messing up the gear pattern,also need to use a brand new yoke nut.

There are those that will say to count the # of turns it takes to get the nut off and put it back on the same # of turns and use Loctite on the old nut but you have a greater then 50% chance of a leak returning and damage to the gears and bearings.


I've fixed many "seeping" diffs by just switching to 85w-140 non-syn gear oil,better for the diff anyways.
Author:  dirtmover [ Fri May 02, 2014 5:52 am ]
Post subject:  Re: Rear diff pinion seal
tjkj2002 wrote:
I've fixed many "seeping" diffs by just switching to 85w-140 non-syn gear oil,better for the diff anyways.


At half the price I'll gladly put in the non-syn oil if it performs as well or better

Would you suggest 85W-140 over 80W-90 when I do very little towing. Also bear in mind we regularly get winter temperatures approaching -20F here. I've heard reports of 85W-140 turning to a Jello like consistency at these temperatures?
Author:  thermorex [ Fri May 02, 2014 12:15 pm ]
Post subject:  Re: Rear diff pinion seal
dirtmover wrote:
tjkj2002 wrote:
I've fixed many "seeping" diffs by just switching to 85w-140 non-syn gear oil,better for the diff anyways.


At half the price I'll gladly put in the non-syn oil if it performs as well or better

Would you suggest 85W-140 over 80W-90 when I do very little towing. Also bear in mind we regularly get winter temperatures approaching -20F here. I've heard reports of 85W-140 turning to a Jello like consistency at these temperatures?


I am sure Tj can give you more info, but what I can tell you for sure, every serious offroader that I met uses Lucas 85W140 nonsynthetic. Granted, I live in Cleveland not Alaska, so we don't get -20 other than with wind chill, but that Lucas 85W140 should be ok till -27F. I went online and pulled the data sheet for 2 oil weight from Lucas:

this is for 80W90: http://www.lucasoil.com/images/medialib ... earOil.pdf

this is for 85W140: https://www.lucasoil.com/images/mediali ... earOil.pdf

as you see, the pour point is just few degrees lower for heavier weight, I would personally use 85W140. Weight-wise, at lower temperature, an 80w or an 85w should not make such a big difference imo.

Also, those synthetic oils I believe are sold more for EPA mileage than for how good they are. I made the mistake to use it and I had to replace the rear seal 15k later...
Author:  tjkj2002 [ Fri May 02, 2014 8:26 pm ]
Post subject:  Re: Rear diff pinion seal
dirtmover wrote:
tjkj2002 wrote:
I've fixed many "seeping" diffs by just switching to 85w-140 non-syn gear oil,better for the diff anyways.


At half the price I'll gladly put in the non-syn oil if it performs as well or better

Would you suggest 85W-140 over 80W-90 when I do very little towing. Also bear in mind we regularly get winter temperatures approaching -20F here. I've heard reports of 85W-140 turning to a Jello like consistency at these temperatures?

I ran 85w-140 in all my vehicles growing up in SD,some winter mornings we saw temps as low as -35 degrees and never had a issue.
Author:  DOC4444 [ Sat May 03, 2014 1:45 am ]
Post subject:  Re: Rear diff pinion seal
SWEPCO 212 has excellent low temp characteristcs, has moly and is a true multi-grade 85W-140 non-synthetic. It totally quieted the carrier bearings in our 8.25 when they started getting noisy.

DOC
Author:  jimymc [ Thu May 08, 2014 8:36 am ]
Post subject:  Re: Rear diff pinion seal
Where do you get the SWEPCO 212?

Sent from my DROID RAZR using Tapatalk 2
Author:  DOC4444 [ Thu May 08, 2014 9:46 am ]
Post subject:  Re: Rear diff pinion seal
I got mine from Paragon Products in Tx

DOC
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