Wow! I really did it this time tore out my 4.8 to install a 5.3 and the cranks are different because of my stick shift. Now I gotta figure out how to fix this

 

Elaborate. Havent heard this one yet. Sure it doesnt have a spacer on it.

 

The new crank is not long enough. When I bolted up the flywheel it tightened into the bolts for the rear seal housing.

 

You just have a 99. the 4.8's had longer cranks

 

Must have a 99 I meant

 

why would you swap a 4.8 to a 5.3... all that work and could have had a 6.0

 

I'm pretty sure a 99 6.0L will swap in fine since it has the longer crank. Either you do a different trans or get a 4l80e crank spacer. I'm sure it'll work then. I just wonder about the pilot bearing mating onto the input shaft of the trans.

 

I just might have to go with a 6.0 then and swap it with a 408 crank with the large snout

 

sure, go ahead. you'll still be swapping out a trans.

 

All you need is the spacer and bolts from GM. As has been mentioned the '99 & '00 4.8L models had the longer crankshaft for use with the manual trans., however the '01 and up models were still available with the manual, yet used the short crankshaft in conjunction with the spacer. (Of course the early 6.0L also had the long crank to work directly with 4L80).