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Tranny and differential fluid synthetic,change out

Old 11-20-2004, 01:01 PM
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Question Tranny and differential fluid synthetic,change out

I know this question has been asked before,my truck is coming up to change the diffs and the tranny fluids(15,000 miles).What are you guys running as far as the synthetics go.I am leaning towards the amsoil products.Thanks for any Info.coobie
Old 11-20-2004, 01:58 PM
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I have Mobile1 75-140 in the diffs right now, but it's too cold for that oil here in AK, so this weekend I am putting Amsoil 75-90 in. -Steve
Old 11-20-2004, 02:10 PM
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AMSOIL 75W-90
Old 11-20-2004, 07:22 PM
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Another Mobil 1 user. You will not be "changing out" your differentials to synthetic, the factory fill is synthetic. Gear oil smells bad, but whatever the factory fill is smells really bad and has an unusual grey color to it.
Old 11-29-2004, 04:26 PM
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I have the Royal Purple 75/140 in the diffs and ATF+4 in the trans and x-fer case.

Works great for me.
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