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Rear end gear oil

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Old 02-26-2010, 04:17 PM   #1
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Rear end gear oil

I was going to change the gear oil in the rear end but i got 2 questions.

1. Is there anyway to drain the oil without cracking the case?

2. The fill point for the rear end is it the plug which seems to accept a 1/2" drive?? I'm not sure how to get it out because it seems rusted anyone ever have any trouble getting them out??

2002 Sonoma SLS 4x4
Old 02-26-2010, 04:21 PM   #2
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Re: Rear end gear oil

If you are going to change it you might as well take the cover off. It's a good time to inspect the internals for wear and carnage. You can just loosen the bolts on the bottom half and let it drain if you feel lazy. Just get some RTV and bolt it back up. Very easy job bro.

Did you actually try to loosen the plug?
Old 02-26-2010, 04:27 PM   #3
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Re: Rear end gear oil

like the rust is built up into it and i couldn't seem to get the end of a wrench in and i'm afraid if drains the oil i won't get the plug out
Old 02-26-2010, 05:10 PM   #4
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Re: Rear end gear oil

Take a pick and get all that crap out. Spray some PB Blaster. Let it sit a bit, Tap the bolt lightly a few time's. Spray again and give her a try.
Old 02-26-2010, 05:17 PM   #5
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Re: Rear end gear oil

Quote: Originally Posted by Drak
like the rust is built up into it and i couldn't seem to get the end of a wrench in and i'm afraid if drains the oil i won't get the plug out
One of my better "life-lessons" was when I learned to make sure I can remove the fill plug before removing any drain plug ... or in your case the rear cover.

I suggest you use a quality extension on your socket wrench for the plug.

Its too easy to twist the end off of many of cheaper tools now on the market.

It also helps if the extension is long enough to give you a straight shot at the plug.
Old 03-03-2010, 10:09 PM   #6
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Re: Rear end gear oil

Most axles with differential covers require it to be removed to drain the oil, unfortunately. It isn't a tough job and nothing some RTV or "The Right Stuff" gasket maker can't fix back up in no time.
Old 03-03-2010, 10:16 PM   #7
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Re: Rear end gear oil

and it should be a 3/8 extension, not 1/2
Old 03-03-2010, 10:18 PM   #8
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Re: Rear end gear oil

Yup, make sure you can get the fill plug out before you drain the oil. Scrape it out the best you can and let it soak with some PB blaster, as said.
Old 03-03-2010, 10:27 PM   #9
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Re: Rear end gear oil

yea, we have all made the mistake at one point or another, and i ended up pouring 2 qts of fluid down the vent on one of my trucks, i have since gotten the plug out and replaced
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