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U joints and pinion seals.

Posted on 7/22/24 at 11:48 am
Posted by Dallaswho
Texas
Member since Dec 2023
2674 posts
Posted on 7/22/24 at 11:48 am
I’ve had a rear differential pinion seal leak three times in the last 5-6 years and 150k miles. First time was obviously because rearmost u joint was completely destroyed. Lucky I didn’t lose the prop. Last two times everything else seems fine.
Anything I should check or look out for? I can’t feel any play but it’s a heavy truck so maybe I just can’t shake it hard enough. Am I installing incorrectly?
Truck is 2003 Ram HD 423,xxx miles. 2WD.
Posted by Fachie
Magnolia
Member since Mar 2017
508 posts
Posted on 7/22/24 at 11:56 am to
Same issue on a 04.5, 2wd 2500 Ram.
Pulled the pinion, cleaned everything up, set everything back up and never an issue after that.
Posted by Dallaswho
Texas
Member since Dec 2023
2674 posts
Posted on 7/22/24 at 2:36 pm to
Would it be correct to say that monster torque spec would only be most critical when pressing in new bearings and less important when just replacing the seal?
I can weld up a yoke adapter to dial it in but that seems like overkill for an otherwise simple job.
Posted by LSUDad
Still on the move
Member since May 2004
60729 posts
Posted on 7/22/24 at 3:20 pm to
Zimmer Gears in Baton Rouge, great work, fair prices.

Posted by Fachie
Magnolia
Member since Mar 2017
508 posts
Posted on 7/22/24 at 3:22 pm to
Yes and no, depends on who you talk to.
Mine only quit seeping after a tear down. Now was that because dumb luck, cleaning everything, or because I cared more to get the right TQ on it who knows. Before I would mark the threads and just TQ it until I got back to the mark.

Yes it was a pain, but I have an unreasonable hatred for anything leaking.
Posted by jake wade
North LA
Member since Oct 2007
2148 posts
Posted on 7/23/24 at 5:53 am to
Check the vent line to make sure it is not plugged.
Check the Yoke for a groove where the seal rides.
Not sure on that particular yoke but, some have a replaceable dust cover that presses on to keep sand/dirt out.
Posted by Dallaswho
Texas
Member since Dec 2023
2674 posts
Posted on 7/23/24 at 10:05 am to
quote:

Check the vent line to make sure it is not plugged.

Shows how much I know about truck axles. Turns out the line is there but the vent is gone. Time to do some cleaning. H&G board comes through again.
Posted by Zakatak
Member since Nov 2011
370 posts
Posted on 7/24/24 at 2:42 pm to
I had a 2006 ram 2500 and think i did the rear pinion once or twice in 140k miles. I think its just a known weak point and fairly common issue. It barely seeped enough on mine to cause dark spots on the front of the housing. It never lost any measurable amount of oil.

The vent may make a difference though and I hope it does for you.
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