front and rear diff oil

snorydermb · October 4, 2006

I m going to be changing front rear diff as well as the transfercase oil what do you suggest I also do alot of heavy towing

95Sierra2500 · October 4, 2006

Well your transfer case should run on ATF (I think...mine I believe does) so I'd suggest switching over to a synthetic ATF in that. As for your diffs, if you don't currently have any leaks at your axle seals, then you should be okay to get a synthetic gear oil in the proper weight. This is my intention once I get around to doing it.

GM-Tech · October 4, 2006

You can use GM's synthetic differential fluid in the front diff... and should use it in the rear. I don't have the part #'s, but any GM parts dept. should be able to take care of you. Also, read this...

Subject: Manual Transmission Fluid Usage in 2007 and Prior Manual Transmissions and Transfer Cases - keywords case fluid transmission transfer #PIP3836 - (06/14/2006)

Models: 2007 and Prior Passenger Cars and Trucks

2007 and Prior HUMMER H2

2007 HUMMER H3

2007 and Prior Saturn Passenger Cars and Trucks

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

Unavailability of manual transmission fluid part number 88861800 U.S. (88861801 Canada).

Recommendation/Instructions:

If fluid part number 88861800 U.S. (88861801 Canada) is unavailable when servicing a manual transmission or transfer case, Dexron III can be used in it's place. DO NOT use Dexron VI in place of the manual transmission fluid in any manual transmissions or transfer cases as a failure may result.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

GMguy99 · October 4, 2006

I WOULD NOT, use anything BUT the GM Stuff in your T-case. I'v used Mobile 1, and Royal Purple in the front and rear with no issues and do a considerable amount of towing and also plow with the truck.

Do you have a limited slip rear?