y5mgisi
1 ton status
This is where i got my info. It would seem that i forgot that engines that came mated to 4l80e's already had the spacer between the crank and flex plate from the factory. So thats probably why you were able to get away with it. They were both orignally bolted to 4l80e's!
http://www.pirate4x4.com/forum/chevy/866064-tech-gen-iii-iv-ls-motor-auto-trans.html
http://www.pirate4x4.com/forum/chevy/866064-tech-gen-iii-iv-ls-motor-auto-trans.html
#enginestillnotintruck 
to get it to actually fit, I thought to myself " I have a 3" body lift and a cowl hood, who cares if the DD mounts raise the engine a little bit.
