Sorry for starting another thread, I could not find the old one.
Had the mechanics look over all of the drive train, to see why the rear wheel locked up for no reason , they seem to think it was in the front differential.
They had a factory guy at the dealer and he did some checking and they never heard of this problem.
They pulled off all of the covers and looked inside for any thing strange and found nothing.
The truck is warrantied for 60K or 5years . Should this happen again I will have it towed to them and they will provide me with a car .
While it was there they will set the truck up for the rear spring tsb fix. My truck has 32K on it. I will be definately keeping the paper work file.
Jeff , 06, V6, SR5, 6spd