Stupid question, but how are you running a 35” tall tire on this truck anyways?"

I don't understand the question... How? I had the stock rims widened 2" for the 315 width; I'm running a 1/2" spacer to clear the inner wheelwells and leaf springs (the left side actually rubs the inner wheelwell at times, no doubt when the tire is flexing with side load - they're not exactly sports car tires).... The ABS and traction control don't like it because of the differing circumference and subsequent tire speed differential, so I yanked the fuse for those systems. Frankly, I would have preferred a shorter tire, but that was the only option for a 315 in a highway tire. But it looks cool, and Ibwas going for a certain look. Mission accomplished. I actually get frequent compliments on it. Of course, people also assume it's fast, which it is not. It's a "reverse sleeper"... I attached a photo. Hopefully it can be viewed all right; I'm doing this from my phone.

"As for a suggestion, how is the play in the bearing in the tailshaft housing on the trans? Also is the rubber sealing/centering O-Ring present?"

Since the yoke and U-joint area are absolutely bone dry and clean, I have to believe the O-ring is intact. Same goes for the tailshaft bearing - I'd think excessive play would result in a battered seal and a leak, which I don't have. I wasn't specifically looking for this condition when I had the driveshaft out and back in again to check U-joints, but didn't notice any looseness. On the contrary, everything felt pretty nice and snug when it went back together.

"You may need to pop the tailshaft housing off to inspect