im in the process of a 6.0/80e swap in my 1500 silverado.. i have a 2500hd driveshaft that is the right length but on the gear end the u joint is bigger than whats coming out of my rear end.. not shure if any of these options are doable but i was thinking of somehow mixing 2 joints, smaller on one set than the other? next i was thinking maybe i could get the part on the rear end that connects to the u joint from the 2500hd and swap it out with mine and just be able to use a 2500 u joint but im not shure if they have different splines or somthing that would keep me from doing that... at worst case i could use my 1500 driveshaft and have cut down, welded back and balanced which seems alot pricer if i could get one of the other options to work.. anyone have any suggestions