Advice needed
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Tuned
Joined: Jun 2019
Posts: 328
Likes: 21
From: Mobile, AL
Advice needed
Okay folks, you've NEVER let me down so here is my question. 2007 Ford F-350 King Ranch PSD, I want to change the front & rear differential fluids, and the fluid in the transfer case. I am going to use 100% synthetic. What viscosity should I use? Thanks in advance for the help.
Cargo Master
Joined: Nov 2007
Posts: 2,238
Likes: 475
I've run Royal Purples 75w90 gear oil in a few rear axles i beat the living snot out of and never had an issue. It's already got an additives package and a friction modifier in it, no need for additional stuff.
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johnnyrocket
Clutch, Transmission, Differential, Axle & Transfer Case
7
Jan 8, 2010 02:39 AM
