Stop the Chatter

Chatter-Free with AMSOIL

AMSOIL synthetic gear lubes and Slip Lock Differential Additive offer exceptional protection and minimal chatter in limited-slip differentials.

Limited-slip differentials typically use clutches to conduct torque between wheels. As soon as both wheels have enough traction, clutch plates come together firmly, but leave enough smooth slip to allow chatter-free turning. When a wheel spins in mud or ice, more power is transmitted to the other wheel through the clutch pack. The gear lube’s frictional characteristics play an essential role in wear and performance. 

Clutch Chatter

Manufacturers of differentials use a variety of spring pressures and clutch disks created with different surface areas and materials. Tension of springs and the friction of the clutch also changes with age, and the requirements of the gear lube friction also vary. If these frictional characteristics aren’t right, abnormal engagement and disengagement of the clutch, called chatter, can happen.

Chatter happens when the clutches continually alternate between sticking and slipping rather than slipping smoothly. Chatter not only generates vibration and loud noises, but it also leads to premature wear. Rather than formulating multiple gear lubes of identical viscosity and different frictional properties to fix chatter in limited-slip differentials, you can instead add gear lube friction-modifier additives that will alter the fluid’s original frictional properties and get rid of chatter.

Will a friction-modifier additive be necessary with AMSOIL synthetic gear lube?

Synthetic gear lubes from AMSOIL are limited-slip capable so they don’t usually require the addition of another friction-modifier additive. Depending on the friction material of the differential and the degree to which the clutch is worn, chatter can sometimes happen. Adding AMSOIL Slip Lock will remove chatter in mechanically-sound differentials.

AMSOIL SEVERE GEAR® Synthetic Gear Lube

SEVERE GEAR® Synthetic Gear Lube is formulated specifically to protect bearings and gears from the challenges of severe-service operation. Its formulation is meant to resist high-heat breakdown, preventing viscosity changes from acid which inhibits gear protection. Because it’s wax-free, AMSOIL SEVERE GEAR® Synthetic Gear Lube improves cold-flow abilities, therefore increasing fuel economy and performance in cold temperatures.

AMSOIL Slip Lock®

Slip Lock® by AMSOIL is formulated with cutting-edge friction modifiers and is specially designed to effectively eradicate gear-housing chatter in vehicles (cars, SUVs and trucks) that have clutch-type limited-slip differentials. Slip Lock is designed for synthetic and petroleum based gear lubes and is a safe replacement for manufacturer-recommended friction modifiers. The convenient squeeze-tube container provides easy and fast application to the gear housing.