A.J.
Active Member
Recently changed diff fluid after gear break in. Put in Royal purple and every time I go freeway speeds it comes out the breather and of course all over everything. I thought maybe it was overfull so I drained it in a clean pan and re filled. Just a little over 2 1/2 pints. 2.7ish I would say. Still any extended (20mi plus) over 60 mph I get it out the breather. Probably not much as it really spreads, but very annoying. I did not have this problem during break in with regular diff fluid. The only other change was PS diff covers same time I changed fluid. Axle is stk jk d44 with zip locker and 5.13's. I can see there being a slight volume difference with the locker and gear change and I am aware the fill hole is way higher on the PS covers. Questions are; Does anyone know the difference in fluid volume from stock open 3.73 diff to zip locker 5.13? Has anyone had this problem specifically with Royal purple? Is there any other possible cause? I don't mind changing fluid, but hate to waste the Royal purple if it is not the problem.