Customer Ratings & Reviews

Had to buy this additive as specified by mopar when changing rear differential gear oil so clutch packs function as intended. One tube is more than enough for the rear.

Used in 2014 Ram pickup

This is the deal I ordered Severe Gear 75w/140 for my rear diff although sever gear comes with slip lock already added. Some have had problems with the limited slip binding in tight maneuvering so I ordered slip lock just in case of a problem. With that being said I have not had any problems/issues with diff

Love the things. I have ordered. Some times it takes a little to long to get the products

Slip Lock added into gear oil as recommended made a significant difference in differential operation and is noticeably quieter.

worked great

great product been using for 7 years my differential working like a champ. I abuse my truck a lot.

Works wonderful!

Great stuff

Added this to the severe gear in my Dakota seems to be working great I definitely feel less resistance from my differentials

Slip lock quietened my heavy duty rear-end and stop the chatter, works great

I need my rear differential to perform when needed, this product is great. DC

Smooth shifting

This product in tandem use with Severe Gear is unbeatable protection for your vehicle.

Can’t tell a difference with it added.

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!