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-   -   best gear oil? (http://www.fordrangerforum.com/drivetrain-tech/6379-gear-oil.html)

TGDKY 01-19-2010 01:47 PM

best gear oil?
 
going to change front and rear diff fluids-what does everyone prefer


Mobil 1- 75-90 full syn
mobil 1-75-140 full syn
lucas 80-90
valvoline 80-90 syn blend

both stock axles- 8.8 rear

BlutoBodine 01-19-2010 02:40 PM

Figure someone will say Royal Purple - I'll mention Amsoil Severe Gear 75W-90. Depending on what I have on the shelf at the time that I need it, I usually use Lucas, Amsoil or Royal Purple.

Ranger01 01-19-2010 06:20 PM

I use the Valvoline Syn blend

Fx4wannabe01 01-19-2010 07:24 PM

OEM spec is 80W90.

I run 75W90 Royal purple(RP is full syn) in both axles, with friction modifier in my rear axle to make it super slippery in the rear with my locker.

I wouldn't run anything 140 on anything on the truck.....that's superthick crap and in a colder environment, it'll goo up.

whitelightening 01-27-2010 04:12 PM

amsoil full synthetic


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