Used this product with Royal Purple (RP) Syncromax in a AWD Buick Versatrak rear differential. Versa fluid costs more than printer ink, and they want a double flush. RP seemed to be working with an occasional ‘groan’. Did a second ‘flush’ with RP and added 2oz of slip lock. So far, no noise at all after 5k miles.

When I bought my truck the rear differential had been rebuilt. When I got it home I installed AmsOil gear lube in it. Immediately I noticed the chatter coming from the rear differential. I called the tech at amsoil and he assured me that the gear lube has the necessary qualities and an additive is not necessary. I just lived with the chatter in the rear differential. A few months ago I needed a mechanic to test drive it to see if there was something up with the transmission. He said no but you've got a lot of chatter in the rear differential. I said well I have amsoil in there and they said it's not necessary to put an additive in there. He says I know, I use amsoil and everything I own. But you have to put the additive in the rear differential anyway. Two tubes he said. When I got home I ordered the differential additive slip lock. When it came in I installed it and went out and drove it around for about 15 minutes and then found an empty parking lot and did figure eights. When I drove away I did not notice any chatter, it was gone. I don't care what anybody says if you got chatter and you still using amsoil gear lube in your rear differential but no additive, install a couple of tubes of the slip lock. It will be gone, and it will be smooth when you turn corners.

Product works as intended, added to a tahoe rear and the tight clutch chatter went away in a day or two. Good stuff

I haven't used this product before and will not use it for some time.

This stuff works as advertised!

I have a Dana 80 on my Ram. It takes over 11qts. Even though the Amsoil gear oil has additive in it, I`m just going for the over kill...

Great performer with your Severe Gear Synyhetic Lube. My diffrrrnyial is smooth, quieter and cooler than the stock GM Lubricants.

Everything works great

I add this to the 75w-140 gear oil that goes into the 2014 Ram1500 every 50,000 mile service. Also use it in the Jeep JKU along with Amsoil 75w90. Despite Amsoil saying their gear oil already has a posi additive. Doesn’t hurt to play it safe, as Mopar calls out for the use of a posi additive.

I always add a tube of Slip lock with every lube change in my Jeep, Ram, and my SRT Challenger. Works as advertised with limited slip differentials.