Well I installed the driveshaft this time. Last time it was done by a different mechanic and both times the shafts were used. I suppose it's possible the parts were already on their way out I chose the shaft I installed this time and this shaft has no play in it so hopefully it will last the 100,000 miles.
I've had 196k on trucks before without an issue with driveshafts. My parents have had nearly 400k on Fords with no driveshaft issues. Something else must be causing it.
