Originally Posted by kbracing96

The way you had it will work fine. Or you can get a newer flex plate and put the spacer on the back side of it. Both ways will work. Just as long as the converter can fully seat in the trans and pulls up to the flex plate about an 1/8" or so when motor and trans are assembled. The converter should be able to spin freely before you bolt it to the flex plate.

Originally Posted by Blackdog76

I have a 4L80E mounted up behind a 6.0L with a 6.0L flexplate and mounted the crank spacer before the flexplate. I know this has been gone over in other posts but it still doesn't add up to me. I looked at the pictures on the "if you are thinking about a 6.0 swap look here" where it shows the longer crank sticking out from the back of the block and it seems like if you were trying to replicate that you would just stick the spacer on to make it work for the 4L80E. If the 99 and 00 6.0L's can be used as is wouldn't that be the same thing as what I did. But then I was looking online and read what it says on the transmissioncenter website, and it clearly says put on after flywheel. I know I'm wrong but why?

the pics below relate to what I'm talking about