Exercise your hubs
Was showing a young lady the finer points of driving a 4X4. Went to show her how to manually lock the hubs on my 04 F-350 4X4 (or$X$). Ooops the center portion would not move. A squirt of WD-40 to free them up followed by moly lube to keep them free. Now on my semi annual service list. (Automatic hubs are exercised every time I put the truck in 4-High to go up our driveway (+20% slope))
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