Crunchy rear end!

[RKrupa]

Should have left it alone, but I didn't. Have 192000 miles on '96 3500 4X4, thought maybe I ought to drain and refill rear end oil. Refilled with SAE 80-90 GL 3-5 lube suitable for limited slip diff's, now it snaps and crunches when cornering. It was fine before. Any ideas? Thanks, Richard

 

[LSMITH]

Put some friction modifier in it. The limited slip oils have some in it, but not enough for a LSD that is fairly tight. Get the Mopar additive, put a half bottle in and drive some figure 8's. If it stops you are good to go, if not add some more and re-do the figure 8's. Keep adding until it stops. If the rear was fine when you drained it you will be fine when you get enough modifier in it.

 

[dan_gilson]

When I changed to my MagHyTec Diff cover, Roy had me purchase 3 bottles of friction modifier. The MagHyTec holds 2x the normal Diff cover.

 

[Swamp Donkey]

Get the stuff from the Dodge Stealers... ..... I got some friction modifier from NAPA and it did not work. Some things you just have to get the "real" stuff. Just added 4 oz today... ... .....

 

[dan_gilson]

The stuff that I got from Roy at MagHyTec works just fine. I stuff from Dodge should work but you might pay more.