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11.5 rear end oil change


hd99fxr3

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Changed the fluid in my 11.5 rear end and used Mobil 1 Full syn. 75w-90. I have since read that the AAM rear end may call for something different. Manual calls for GL-5 syn. I believe. Mopar's fluid says for use in AAM axels. Is this marketing hype or legidement need?

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I have called and talked to AAM and they spec 75w-90 for all loads/temps. They said if you live well above GCWR and tow thru death valley most the time then 75w-140 would be better, otherwise stick to 75w-90. Even the max tow (GCWR of 30K) uses 75w-90, but with a finned cover.

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