I went through a huge thing with ford when my rear end went into self destruct mode!
back in Nov, 2010. Truck had 10000 miles on it. Been off roading all day, truck in 2WD, off road mode, all nannies off, and rear end locked. Went into a power slide in the sand and BANG! Got kicked out of everything immediately. Snapped the driver side axle almost at the diff. I had to drive out of the park since it was closing in less than 1 hour. Drive was 5 miles with the only thing holding the tire on was the brakes. Got a trailer and towed it back home 4 hours away.
Dealership looks and sees that the brakes are spread open, the axle housing was bent, the drive shaft had broken and basically jammed what was left into the diff messing that all up and all the shards just carved crap into everything. The whole rear end needed to be replaced
A dealership has to do a price comparison of it being cheaper to order all the pieces separate, or a whole new rear end. A whole set was cheaper, that was overnighted.
Upon reassembly, they noticed the driver rear shock had been blown out. On the shock cover there was a hole about golf ball size from taking my truck in the desert over 9000 miles ago. Even though they couldn't prove it, prior damage to the cover ended the warranty on the shock. We told them that happened 6 months ago but they didn't care.
We went back and forth with ford motor company big shots, finally got everything taken care of.