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2011 Yukon XL 2500 front diff pinion seal leak
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Question
arzinet
I bought this truck in 2012 with 20,000 km on it. It's now at 170,000 km and over that time I've had the front diff pinion seal replaced four times due to leaks. I've even had the front diff removed, rebuilt and resealed, and still had the pinion seal leak again a year later. I took it back and they were nice enough to replace the seal for me, but now it's six months later and leaking again.
Mostly the earlier leaks were just slow drips, but this time it sprayed oil all over the exhaust, making a hell of a smoke show. Wife had to pull over on the highway and a passing motorist ran over with a fire extinguisher, thinking it was on fire. Not a fun time.
Is this just an issue with these trucks and it's always going to leak? I asked the shop the last time to triple check everything to make sure there was no other issue that could be causing the seals to leak so quickly, but they assured me everything was fine. They just said maybe it was a bit of dirt or something under the seal and "It happens sometimes." Yeah, but four times in 150,000 km?
And it wasn't just one shop - I've had the seals replaced at the dealer as well. Time to find a third shop who knows what they're doing? Anything I should ask them to look out for?
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