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

Used it with Mobil One synthetic on my 2016 Challenger and it finally quieted the beast down....

I picked this up in a pinch for my 2008 Ford Mustang GT when I was changing our the rear end gears. I couldnt get my hands on the Ford friction modifier, so I picked up a tube of this instead. I was a little skeptical because I knew nothing about it. However, is been two weeks since I put this in my differential, and everything has been just fine. I dont get any chatter from the limited slip differential. Everything feels normal with the car. I would use this again.

Diff sounds good

Installed new gears which I purchased here and since my 67 GTO has Safe-T-Track, it requires this additive. Works as it should, just pour the complete contents into the rear end prior to filling with fluid. This helps it mix itself when you add the diff. fluid (which I also purchased here).

I use this and 3 quarts of Mobil1 75w90 LS gear oil in my 2002 Tundra. Without this additive, the LS clutches will chatter.

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.

Great product

Seems to be working as expected. Only been installed for about 500 miles.

works well, no chatter .

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.