Well, im going to change out my rear end fluid.
There are many choices
I have the Chrysler 9.25 with trac lock (limited slip) Which means i need to add the hypoid friction modifier right? It has 165,000 miles on it. And im not sure if its been touched...
Ive been running some choices threw my head. From the factory my rear came with 75w90.
I can use Royal Purple synthetic which it says it has the friction modifier in it and theres no need to add any. Or i can use Valvoline synpower(Has the modifier), Mobile 1 synthetic (Has the modifier), Or valvoline (not synthetic) gear oil wich states it can be used in limited slip diffs also.
Now, should i go with 75w90? What do you guys reccomend? Should i go with Non synthetic or synthetic? Is synthetic really ok for limited slips? And is it ok to use it with my mileage?
Also, should i trust when they say that there gear oil is safe to use in limited slips and not add any friction modifier to it?
Any help at all will be greatly appreciated.
Last edited by DODGEPWR; 02-22-2010 at 02:30 PM.