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Rear diff gear oil change
Just finished engine oil change and gear oil in the rear diff @310K. Got a 16 hour drive coming up soon.
Truck is RWD 9.25 corporate rear axle, open diff. Used Supertech full syn 75W90. The oil I removed had 56.5K on it and it was honey color. The magnet had barely any build up, a light dusting caked on. After removing the bolts, I had a really hard time breaking the seal to get the cover off. It laughed at my rubber mallet. I put the floor jack so it barely caught the lip of the diff cover, then jacked it up to break the seal. That resulted in a floor full of gear oil though. What a mess. I realized it wasn't worth pulling the diff cover and having to deal with scraping the seal off mating surfaces, etc. The oil stays clean with an open diff. Next time I'll just stick one of those hand pumps down the fill hole and pump it out. |
Originally Posted by Dodgevity
(Post 3462398)
Just finished engine oil change and gear oil in the rear diff @310K. Got a 16 hour drive coming up soon.
Truck is RWD 9.25 corporate rear axle, open diff. Used Supertech full syn 75W90. The oil I removed had 56.5K on it and it was honey color. The magnet had barely any build up, a light dusting caked on. After removing the bolts, I had a really hard time breaking the seal to get the cover off. It laughed at my rubber mallet. I put the floor jack so it barely caught the lip of the diff cover, then jacked it up to break the seal. That resulted in a floor full of gear oil though. What a mess. I realized it wasn't worth pulling the diff cover and having to deal with scraping the seal off mating surfaces, etc. The oil stays clean with an open diff. Next time I'll just stick one of those hand pumps down the fill hole and pump it out. |
I wished they would put drain plugs on the diff. Covers. But you get to inspect everything with the cover off.
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Originally Posted by rebeltaz83
(Post 3462441)
I wished they would put drain plugs on the diff. Covers. But you get to inspect everything with the cover off.
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Originally Posted by Dodgevity
(Post 3462457)
That would make sense, right? They do sell the covers with drain plugs (aftermarket), but I don't do this enough to justify the expense. Being that the open diff has no clutches, I think I'll be fine with just pumping it out next few times at least.
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