Formulated with advanced friction modifier. Designed to eliminate gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, posi-traction and locking differentials. Formulated for use with both synthetic and petroleum gear lubricants and safely replaces manufacturer-recommended friction modifiers.
Package sizes include:
4-oz. Bottle
4-oz. Bottles (case of 12)
When making a turn, the outer wheels of a vehicle must travel faster than the inner wheels. It is up to the differential to act as a balance arm, establishing constant equilibrium of torques and forces between the left-hand and right-hand driven wheels. In standard (or open) differentials, power is directed to the wheel offering the least resistance. This works well when making a turn, but in a situation where one wheel is lifted off the ground, it causes the suspended wheel to turn while the other remains motionless.
Limited-slip (or positraction) and locking differentials are traction-increasing devices. Locking differentials transfer all available torque to both wheels. The teeth of the spider assembly engage with those on the locker clutch, causing both axle shafts to operate as one. Locking differentials don't allow one drive wheel to spin while the other remains stationary. Instead, they keep both wheels in drive mode, but unlock to permit different wheel speeds when turning. The engaging and disengaging of the teeth on automatic locking differentials often causes a banging and clunking sound. Manual locking differentials usually use an electric motor or vacuum diaphragm to engage the locker, reducing this noise.
Limited-slip differentials allow different wheel speeds when turning, but when one wheel loses traction, greater torque is transferred to the wheel offering more resistance. Limited-slip differentials make use of friction between clutch plates, as opposed to the meshing teeth employed by locking differentials. Transferring less torque per side, limited-slip differentials are generally smoother and quieter than locking differentials, but still sometimes "chatter" when transferring torque to the wheel with traction.
In some differential applications, a friction modifier additive is necessary to reduce chatter. AMSOIL Slip-Lock Differential Additive is formulated with advanced friction modifiers and is designed to eliminate gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, positraction and locking differentials. It also reduces the banging and clunking associated with automatic locking differentials.
AMSOIL Slip-Lock Differential Additive is formulated for use with both synthetic and petroleum gear lubricants and safely replaces manufacturer recommended friction modifiers. Its convenient flip-top dispenser provides quick and easy application to the gear housing. One four-ounce bottle of Slip-Lock treats differential capacities of two to four quarts. It is not for use in automatic transmissions or other applications requiring ATF.
NOTE: AMSOIL Synthetic Gear Lubes do not require the use of this additive. However, not all differentials respond the same and if chatter is noticed, the addition of AMSOIL Slip-Lock will eliminate it. For chattering differentials not running AMSOIL Gear Lube, this product is an excellent solution to the problem.
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).
Click here to view the MSDS Data Sheet for AMSOIL ADA.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
Product Name: Slip Lock Differential Additive (ADA)
Current Rating: 5out of 5 stars
Votes & Reviews: 8 vote(s) and 7 user reviews.
Reviewed by Be: 
For the cost and better product than the dealership, I would highly recommend this.
Reviewed by Librabluuz:
Bought this when I changed oout my diff fluids on my 15 rubicon. Super easy to use.
Reviewed by William:
I own a Ford which is notorious for gear chatter when I change the front and rear differential fluid without adding slip lock. Amsoil sells it in the exact size I need, so there's no leftovers to worry about losing or misplacing. I just add it in with my differential fluid.
Reviewed by Dietter:
Noise dropped after use.(Ford Axel)
Reviewed by BV:
Installed a new ring and pinion with Yukon brand limited slip differential on a 8.2" 10 bolt. Works great with one tube of AMSOIL Sliplock and 75/140 gear lube.
Reviewed by Hank the Tank:
I was on a vacation up on the north shore of Minnesota. I was near amsoil in Superior, WI. I was pulling a 45' 5th wheel with my 2005 f350. Before the trip I changed the rear differential fluid to amsoil severe gear. I was having some rear end chatter. I stopped into amsoil and picked up some of this and it did the trick!
Slip lock gear oil additive
As with all other AMSOIL products that I use in everything I love it and recommend all their products to everyone who cares about their investments.