Hi Maverick, I had forgotten my old truck had a 2-piece driveshaft. . . it's been a few years since it left Kennewick and went to Massachusetts. My '98 shortbed 2wd I have now has a 1-piece aluminum driveshaft and it's nice and smooth. The measurements wouldn't be the same though being it's a 2nd Gen.
Do you have launch shudder or does it shudder because of tired U-joints? That truck was darned smooth when it was new. Mark S. did use that truck to haul a massive 40-foot TT to Florida & back a couple times, that probably didn't help the driveshaft. Have you priced out a new center bearing & U-joints?
Vaughn