Do you use Lithium soap, Moly grease or MB's grease? I've had great success in all my vehicles with Moly including my 1 ton trucks. The only drawback is some grease (5 or 6 drops of oil) will seep past the cap, even with a new cap. I grease bearing every 2 years or 50K. I've tried other greases with friction modifiers and have never been happy with the results. These greases are usually too viscos and do not seem to flow when the spindles/bearing heat up due to braking. In addition, some lithium soaps in this humid houston weather seem to harden and become discolored even when the grease is in the can.