Monte417

Agreed. OP what axle seals are you installing? I would use the mopar seals all other seals I've used have leaked especially the Yukon ones. Are you greasing the lips of the seals before putting the carrier back in so the shafts don't nick the lips? All those plastic guides out the the tubes? They have a tendency to run down towards the seals wedging up against the seal and causing a leak. That's what happened to me

ktoth87

The company I bought it through has said they will go through with a warranty if need be. But do I need that? I don't really feel like pulling the whole thing out shipping it back and waiting on another one if I don't need too.

ktoth87

I have used the seals dynatrac recommended. And oem. In fact the original seal that came out are mopar. I have lubricated every time. I don't have plastic guides on these shafts.

jtphoto JK

I'm wondering if your vent hose is plugged. Long drives, heat and elevation can change the pressure in the housing pushing oil past the seals.

larry0071

So, when you pull the seals that failed and clean/inspect them... are you seeing anything? Are you seeing a section of rubber worn thinner or differently than the rest?

If the axle were welded up out-of-true and the tubes were forcing the shafts to side load into the seal and ultimately into the differential... you should see that a 1/4 or 1/3 of the seal rubber is showing as thin, possibly worn through or even with some amount worn away completely. The post mortem can possibly tell you things that would otherwise be tough to tell. Hopefully you still have the seals.

If you replaced the seals and saw nothing indicating unusual axle shaft wear on the seal surface, then look as mentioned before at your vent line. Can you blow air in and out of the housing?

Ripa777

They also found a grove on the left fry axle. Bottom line.... love Dynatrac products but I would HIGHLY recommend that if anyone is in the market for PR44 they should bite the bullet and order an entire set up from Dynatrac. These guys r top notch and absolutely stand by their product. However, Dynatrac can NOT control every shops install work!

ktoth87

Vent line is clear. And I have all of the old seals three sets and the fourth just installed today. They all appear good. I did a very basic text earlier in this thread where I used fluid and the axle shaft to see if it was leaking around where they meet. We'll see if these seals last any longer than the last. I know these seals are a common issue but not this common.

Monte417

Only other thing I can think of is your axle shaft surfaces are not mating properly with the seal. What shafts are you using and what spline count? That test you mentioned really can't be used as a good barometer because they aren't spinning at a high velocity. If it were me I would try some different shafts if the problem persist

jtphoto JK

If he uses the latest gen Mopar seals they are 2 piece. The inner ring seals on the axle itself and that turns within the outer piece. There should. E no issue with those when installed properly.

ktoth87

I just bought mopar seals. Not sure if they are the newer design. The old seals arnt egg shaped or uneven which led me to believe the shafts are good. The only difference in the 4 sets is the first 2 sets used silicone. Cutting out the silicone made a difference. I recently spoke to a friend who works for a Dodge jeep dealer and he said they never use silicone on them. Which in the past I've done these seals and have never used silicone.
Dynatrac if you had built this axle what shafts would you have used? If I get another leak that'll be the next step.