Does a 1997 Dodge 3500 RamVan's Rear Diff. require special fluid ?

Ive heard yes...as well as no. I just changed out the old factory fluid with Full Synthetic Mobil 1 Rear Diff. Fluid (17,000 miles) ; is Mobil 1 Syn. Diff Fluid acceptable to Dodge Specs on the Rear Diff ??
Thanks, Dave
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Absolutely. The only thing "special" is a limited-slip additive, if you have a limited-slip rear. Any parts store will carry this, and the D70 axle takes about 8oz. of additive. If it turns out that you need this (ie. you have a limited slip differential), you'll need to either suck some fluid out from the fill plug hole, and add the fluid, or just jack the rear end up (or park on a hill, nose-low) and add the fluid (an extra 8oz. won't hurt anything).
If you don't know if you have a limited slip differential or not, put the van in park, jack up the rear, and spin a rear tire. If you can spin it (with the other tire spinning in the opposite direction), you do NOT have a limited slip. If you can't turn the tire, then you DO have a limited slip, and should add the modifier to prevent clutch chatter (ratcheting noise coming from the rear end while going around corners).
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Good info. Thanks.
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Dave in Lake Villa wrote:

Dave; why are you posting as fast1970Vette *and* DaviinLakeVilla? Have you got some hidden agenda of perhaps answering yourself and agreeing totally just in case everyone else thinks you're talking out of the wrong hole? As they say; there's nothing new under the sun!
--
My part-time website is at http://5110.sytes.net
The full-time one is at http://www.geocities.com/spmf38 , but there's
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