The 01 Yukon I just bought had the front differential rebuilt. The shop I work at actually just had it done. Well 500 miles later a ton of metal in the fluid and it looks pretty rough. So it's being sent back out to be rebuilt. The rebuilder is reputable so it's kind of a surprise. That being said what would be a darn good gear oil for this application? Obviously want to be over cautious and use the best of the best I can get to get the longest life possible from it.
Gear oil for a freshly rebuilt front diff 01 yukon
- Thread starter wheelman
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- Sep 19, 2020
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Were the ring and pinion replaced as well, or just the shims/bearings/etc? If the former, totally expected. It's like breaking in an engine. You have to swap out that oil after a few hundred miles with fresh gear oil.
Bearings, races, seals and a adjuster but was replaced. It's a lot of metal. Glitter all over the inside.
Needs gears. The hard face is worn off.
Why put the same gears back when all the hard work is done? I used synpower when I had my differentials rebuilt. The first drain was a little alarming but I dont remember it that bad. Been 6-7 years without issue. Just run it
Any synthetic 75w90 would be good. Valvoline has that pouch that makes it easier to fill if space is tight 
But even ST 75w90 is good.
But even ST 75w90 is good.
I’ve seen chards not quite as bad as that in a rear 14 bolt in a 3/4 ton Suburban. The diff is functioning fine with no noise and 240,000 miles on it.
Surprisingly no...... But the seals started leaking. Thought was all the metal tore the axle seals up and made it leak but that's just a guess.
