I had a dynatrac kit on my old 03 f250. I wheeled it on powerlines and local mudholes before i built my current rig and the 03 became the tow rig, plus it was my dd all along. Long story short, one night i sunk the diesel f250 to the frame in what was basically quick sand for a truck, it was firm enough to walk on, truck sank. With the front arb engaged, I broke both locking hubs, both outer stub shafts, and the broken stubs broke the wheel bearings. I had to dig for 7 hours to make a f250 hole so the wrecker could pull me out. It was going to cost $1650 for me to get all that stuff, plus the orings and such from ford with my wholesale price from work. Dynatrac was $1850 back then and the stubs and hubs were 35 spline upgrades. Since i was wheeling it I spent the $.
A month later my 78 f150 crawler showed up at the scrap yard a friend worked at, so I bought it and made it my wheeler, lowered the f250 and went from 38s to 35s for tow/dd duty.
Anyway, unless you have monster tires that eat unit bearings, or you beat it off road, just get quality unit bearings, even if they need to be replaced every 100k miles the truck will be worn slap out before you break even.
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