limited slip has too much slip

[rkingdave]

Hi, my 89 f150 with a 3.55 8.8 Limited Slip diff seems to slip too much in my opinion, what can be done to help tighten it up??

[Donnie]

Dave, how are you making this test?...What makes you think that it is not working correctly?.........Donnie

[rkingdave]

I recently had to park on a grassy incline, while going back up it it just spun the rr wheel all the way up it. is there any additive that might help it?

[ultraranger]

Sounds like it may be time to replace the steels and friction discs inside the differential. Traction-Lok differentials should also have 4-ounces of friction modifier added to the gear oil.