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Old 01-21-2009, 02:00 PM   #1
Nes881
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Default What diff fluid do I use?

Ok, so last week my wife spun out on a snow storm and bent my r/r axle on my 1999 GMC Yukon SLT 4X4. I'm replacing the axle this weekend, what kind of fluid does the rear diff take? And do I have to use an additive? Its a locking rear differential, any help is greatley appreciated.......thanks.
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Old 01-21-2009, 10:09 PM   #2
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Anyone?
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Old 01-21-2009, 10:13 PM   #3
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I use castrol synthetic 80w-90 gear oil. Some people use other fluids. Some recommend ATF but I tow alot and like something that sticks to your ribs so i go with a heavier weighted oil.
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Old 01-22-2009, 12:03 PM   #4
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GOOD LUCK. I say that cuz I was in the same situation bout a month ago- needing to know what diff fluid to use, and the suggestions are endless. I searched here and elsewhere on the internet and found so many "opinions" and not one single definite answer. I even called a couple GM dealerships in the area and found conflicting info between them. I ended up having to change out my locked up G80 diff and went with a Detroit True-Trac. It doesnt have any type of clutches so I used Royal Purple synthetic. Sorry I cant give you a definite answer, as I never found one myself. Good luck with your search!
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Old 01-22-2009, 09:20 PM   #5
Nes881
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ok thanks, I used my Alldata at work at it says to use synthetic 75w 90
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Old 01-22-2009, 09:42 PM   #6
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use a good diff oil. Use Royal purple, Castrol or Mobil 1 synthetic. There are several things that I don't think anyone should skimp on when it comes to vehicles and one is fluids!
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Old 01-22-2009, 09:46 PM   #7
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Im gonna be using oem fluid
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Old 01-22-2009, 10:24 PM   #8
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Quote:
Originally Posted by Nes881 View Post
Im gonna be using oem fluid
The Grape sented stuff? $30+ per quart:rolleyes2:
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Old 01-23-2009, 01:11 PM   #9
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A quick heads up on OEM diff fluid, before I decided to change my diff all together, I went to the dealership and got their stuff. (3) 23 oz. bottles off diff fluid and friction modifier additive= $48. REGULAR MINERAL OIL-NOT SYNTHETIC. Overpriced BS that was returned the next day.
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Old 01-23-2009, 01:43 PM   #10
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Simple 80w-90 is perfect and cheap.
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