Originally Posted by noahlon
Had a pair on a Jeep pick-up years ago. They worked pretty good until you put a load on them then would slip. I always ran them locked because of that. They have roller bearings that grab when the axle spins faster than the wheel.
Overgreasing could cause that. A thin coat of grease is all that's required although I believe the factory reccommended manually locking the hubs for heavy pulling, anyway. I had a set of Lock-O-Matics on an earlier Jeep and have the later Warn Automatic on my present Jeep. The difference between the two is in the manual lock mechanism. I like them, they've been very trouble free. Warn discontinued those a number of years ago. I believe Herm The Overdrive Guy
in Brush Prairie, WA., bought out the parts inventory from Warn.