Hey guys and gals I am doing a 4l80 swap ordered all my parts and the guy at patc said I needed the spacers for the crank shaft and a new flex plate? Thought I only need the spacers or a new flex plate? Can anyone shed some light on me

 

A crank spacer is required so the flexplate will reach the convertor.
It's like that from the factory on all the 01-09 LS based vehicles using the 4L80E transmission.

In 99-00 they had a special crank but in order to cut cost, they used a standard crank and a spacer to make up the difference so they didn't require a special crankshaft.

 

you need both

 

You can use a 4l60 flexplate with a 60/80 converter which wont require any spacers

 

You will need both.

 

Like he said, some converter builders can build you a converter that will work with your 80e and bolt up to your stock 3 bolt flex plate with no spacer.

 

I've got tubular crossmembers if you need one.

 

Correct. Greg at Phoenix built my 80e converter to work with my stock flex plate

 

Get one from this guy it's bad ***.

 

my circle D converter bolted up just fine without the spacer, but with the stock 80e converter I needed the spacer to get the converter spacing in spec.