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Discussion Starter #1
What diff oil are you guys running? The car is a 2001 GT with factory 3.55 gear IRS that sees mostly spirited drives. I have used Royal Purple is my daily SRT8's IRS but not a big fan of it. Wondering if RP will serve my Mustang better?
 

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Any synthetic 75W140 gear oil with the friction modifier additive.
Some guys like Amsoil, Redline or the Motorcraft branded stuff.

Takes about 1.3 quarts.
 

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Discussion Starter #3
Thanks 2D.
 
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