i got the 4l80e all into place in my 2000 reg cab short bed 4x4. and i was thinking of gettting my rear shaft shortend. i got a front shaft from a 2500hd from a junkyard but it looks like that shaft i have now only smaller in diameter.... not sure if they gave me the wrong one or what just wondering if i can get the one i have now lenghend or just need the right 2500 shaft.... thanks guys!