Dennis Christensen Member Dec 16, 2011 51 0 6 Oahu, Hawaii Feb 17, 2012 #1 Feb 17, 2012 #1 Question for everyone I'm putting 410 gears in my mustang tonight the rear differential cover says. 75w140 only but local stores didn't have it so I got Royal Purple 85w140 will that be ok or cause problems thanks everyone!
Question for everyone I'm putting 410 gears in my mustang tonight the rear differential cover says. 75w140 only but local stores didn't have it so I got Royal Purple 85w140 will that be ok or cause problems thanks everyone!
BurningRubber 10 Year Member Dec 6, 2004 1,865 24 58 Feb 20, 2012 #3 Feb 20, 2012 #3 85 will be fine but as stated, you'll need to add friction modifier unless the gear oil already contains it. It should clearly say so if it does.
85 will be fine but as stated, you'll need to add friction modifier unless the gear oil already contains it. It should clearly say so if it does.
Bad Sheep Well-Known Member Jul 7, 2010 212 113 63 ontario Feb 20, 2012 #4 Feb 20, 2012 #4 If I remeber correctly Royal Purple already has the friction modifier in it.