K&W 402508 Trans-X Posi Trac Limited Slip Gear Oil Additive - 7 Fl Oz

Three stars because it probably will work for some but it didn’t fix the chatter on my F-150. The Motorcraft XL-3 stuff did though.

Diff sounds good

not sure if it was this or the drives haft adjustment that quieted the howl?

:)

Smooth posi traction.Product works.

Only need 1 tube & no chatter

worked good! Half a bottle for a 2020 scat pack differential No chatters with sharp / wide turns clutches grab normal I’ll buy it again . Not much else to say.

Good product.. the rear in my truck feels like its a little bit smoother

Got rid of the stutter in the rear end of my Expedition when going around corners. I added the entire tube when I installed new bearings and seals in my axle.

Easy to get into rear diff with the package design