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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Stops chatter
By 
BLAKE, 
a 
Verified Buyer 
on 
April 28, 2024
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.
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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Amsoil Slip Lock
By 
DANIEL, 
a 
Verified Buyer 
on 
August 24, 2023
After years of rear diff. chatter in my 2003 Ford Ranger FX 4X4, Slip Lock, along with Amsoil 75w140 gear oil, the chatter stopped!! (performed a complete drain and re-fill)
By 
Russell , 
a 
Verified Buyer 
from 
Georgia 
on 
April 28, 2023
Even though the Amsoil Severe Gear Gear Oil comes with a little Limited Slip additive. I wanted to make sure my rear diff in my 2013 Tacoma doesn't have the chatter. This Slip lock works well in my Tacoma.
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