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10.25 Diff Fluid - Opinions?

1K views 2 replies 1 participant last post by  CumminsTrader 
#1 ·
All,

I am a firm believer in synthetics and in Mobil 1. It is time for a diff fluid change and possibly adding the late model SD diff cover. I have in my possesion several bottles of 75w-140 Mobil 1 Diff fluid. Anyone running this? I beleive it is above the viscosity specification that Ford calls out, but then again, my truck only gets used in summer and warm-hot weather for towing. Anybody think this would be a problem to run?

Cory
 
#2 ·
Nevermind, it appears that this is common to switch to the higher 75w-140 vs. 75w-90.

BTW, Tousley Ford - White Bear Lake, MN has the Ford SD covers for the '08-'11 (Ford PN 8C3Z-4033-A) for $46 with online pricing.

Tousley Ford Parts Depot

Cory
 
#3 ·
Oh and the finned cover for the Dana 80 is a 6C3Z-4033-A ....$145.52 USD

Cory
 
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