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.

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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.

Thanks, I'll give that a try first. It's due a change anyway and most of my towing is pretty light duty nowadays.

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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.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

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?

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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.

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?

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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...

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

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.

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

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP

Where do you get the SWEPCO 212?

Sent from my DROID RAZR using Tapatalk 2

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Jim

2003 Liberty Renegade
Leather Electric Seats
Self-Dimming Mirrors
Sun Roof
MOPAR Rock Rails, Skids, Rear Hitch
EMU Heavy Duty shocks and Springs 2.5" lift
Front Tow Bar (for RV)
Firestone 255 70 16 Destination AT Tires
Straps and Chains

I got mine from Paragon Products in Tx

DOC

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP