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

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).

works well, no chatter .

Many vehicles need this, check if your project requires it. I use it when necessary and it is a great additive.

Stopped my rearend 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.

Only need 1 tube & no chatter

I have used this product for many years in 1998 Ford Explorer XLT, V6 engine, auto transmission and does exactly what it is supposed to do in a posi-traction differential which require a limited slip additive. Differentials require service every couple of years (3-5) depending on use and mileage, as the lubricant thickens and becomes black, so its time for rear end service. Once removing the rear end cover proceed to drain and clean, apply a new rear end cover gasket to the cover and seal the differential. I squeeze in a tube of this stuff and fill with 3 quarts of the recommended synthetic gear oil for your car or truck, until the lubricant starts to pour out of the fill hole. I have never had any problems, no leaks, no noises, no shuttering, just a smooth sailing ride with something so simple and easy as part of routine maintenance every few years. Check the differential every year, fill if needed. Happy motoring!

Works great. Took the chatter away from the clutch pack.

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

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