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

This oil fixed my whaaaanning rear axel issue on my 2000 Firebird Trans Am with the 3.42 LSD. Yes, I had the GM required additive already mixed in the synthetic gear oil. Never had a problem until one day in SoCal. When my car was driving for a bit and and warmed up, from a dead stop, needing to make any basic right turn (90 degree), (or sharp turns too) The axel would produce a profound, yet awful sound that intensified thru the turn but terminated once all the wheels turning at same speed, driving straight following the turn. Ill do my best to describe my sound, what Id heard, and as accurate as possible. This was a very specific situation when the sound was emmited. Ive read similar but also different stories and this stuff resolved my problem. The noise sounded like a roaring whanning rotational sound that would whirl (or wind-up wow wow wow wow sound, intesity and pitch increased with speed) as you proceed thru the turn under acceleration. The noise would not occur with you coast thru turns or not giving her any gas at all. I can compare another sound Ive heard to my noise- almost like or similar to a sound when a manual car is going in reverse at high torque/speed or up a hill. Hope this helps everyone. This stuff worked for me. Hell yeah!

trans-x posi track additive have used this for years with no bad results

Works great for my Detroit Locker

Easy to get into rear diff with the package design

I only got to put half in and it worked on a thumping differential

Great product for stopping or at least slowing shakes and shimmies in the transition.

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!

It is in the axle and the gears are turning. No noises, thumping, or cracking, so it must be working.

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