Hello all just wanted to share what I found in trying to trouble shoot a sever shudder from a stop untill about 5 mph. My innitial assumption was that it was a rear oil seal that was blown, putting oil on the fly wheel and causing the pressure plate to slip a bit before getting up to speed. I needed to change the head gasket as well, so I figured I would just pull the engine do the clutch and oilseal at the same time. Last night in the process of unbolting the engine from the transmission, I think I found the issues. Some numb nuts who had removed the tranny (I have only had the truck for a week) never torqued the transmission to engine bolts. By the time I got to it, there were a few bolts that had completely fallen out, and of the 4 bolts that were left, the two right near the head were only finger tight. I am pretty sure that is what was causing the bouncing from a standstill. Ill update everyone once I get everything back together.

 

I hope you decided to separate the engine from the trans anyways to eliminate any possibility of wear on the input shaft, pilot bearing, clutch springs and pressure plate.

Vibrations make things move and when things move, they wear.