Question about 1998 GMC Jimmy
Like all rear axels, their is a drain plugg sometimes at the bottom but the top one is for refill. usually, a 3/8 socket wrench is used directly in the plug. turn counter-clockwise to unscrew it and fill with appropriate gear oil (80w90)
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
well, you should really drain all the old oil out, since you will have it out from under the truck and easily handled anyway. Also, I like to add a little Lucas oil stabilizer to the oil too, just a little extra protection for a part that does alot of work. As far as the lubricant goes, I have found that good ol 80W90 does just fine. Let me know if this helps :)
Posted on Jun 08, 2009
Tips for a great answer:
Jan 21, 2013 | 1998 Ford Expedition
The rear end gear box usually has fill plug about 1/3 of
the way up the gear box housing. The gear oil is usually filled to the bottom
side of the plug. In other words, if you were to try to add gear oil, you would
stop when the oil starts to spill back out of the plug hole.
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