Red Line Friction Modifier

Price: $7.95

Compatible with petroluem or synthetic gear oils, this product will
significantly reduce the friction break-in of differentials, reducing
break-in temps for as much as 50 degrees F. Limited slip or
positraction units will often chatter without use of this product or a
gear oil with a similar modifier, so add only enough to eliminate the
chatter and avoid making the plates or clutches too slippery.