I'm gonna subtitle this : ALL DRESSED UP AND NOWHERE TO GO:
Man did I F up. I never thought to take into account the cranks may be different between my 95 with 3 speed auto trans, and the crank in the 98 ( with unknown trans )I completely rebuilt. Like an ass, I assumed they were the same...
Turns out the ID of the hole in the end of the crankshaft on the new motor (98) is 16.36mm while the same hole in the old (95) crankshaft end is 20.97mm. We didn't realize it until a third party showed up to help and got under the truck to see what was holding up the engine and trans from coupling completely and even he couldn't figure it out. So we pulled the motor back out and started to really look, and that's when we discovered the difference. The centering nub in my torque converter is MUCH bigger than the hole in the end of the crank where it should fit. TC centering nub measures 20.75 at it's widest diameter. There is also a difference in the off set of the flex plate. The flex plate will bottom against the mounting bosses of the torque converter before the trans and engine are completely joined. F*#!!!!
I measured everything once we got the engine back out ( F AGAIN!) and the difference in depth from the oil seal housing to the outside edge of the crank where the flex plate bolts is also significant: old measures 7.86mm, new is 6.09mm.
So now I have a real dilemma: try and find a flex plate/torque converter that will mate between my 3speed auto and this 98 crankshaft, or tear the engine apart and have the old crank ground and refit with new bearings to install in the new block, or rebuild the bottom end of my old engine and put the fresh head on it. what a pita.
So, anyone done this newer to older swap and know what fits? Help