CSX4833 Posted November 18, 2012 Report Share Posted November 18, 2012 Grabber and others on this site convinced me that Royal Purple is the way to go for the transmission fluid. Now, do folks feel the same way about changing the differential fluid to Royal Purple as well? Does it ave te same dramatic improvement. Any thoughts would be greatly appreciated. Have a great Thanksgiving Link to comment Share on other sites More sharing options...
kgillespie06 Posted November 18, 2012 Report Share Posted November 18, 2012 When I installed the Shelby Axle Cover/Girdle, I went with the Royal Purple Max Gear, 75W-140. Afterwards, I did not notice any difference with the rear differential performance. I switched only because I prefer RP products. Link to comment Share on other sites More sharing options...
CSX4833 Posted November 19, 2012 Author Report Share Posted November 19, 2012 KLG, thanks. I had heard that differential gear oil wasn't as impact full as transmission fluid was but I just wasn't sure. Thanks. Link to comment Share on other sites More sharing options...
MJN Posted November 19, 2012 Report Share Posted November 19, 2012 AMSOIL in the garage waiting to go in for me. Link to comment Share on other sites More sharing options...
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