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I've not paid much attention in the past to converter spacing and managed to not kill anything. Just built a 4L60E and put it in a 2000 trans am. Whipped out my drill bits to check gap and I've got between .375 to .39 inch gap between converter face and flex plate face. To get .125" (1/8") pull out I would need a .250" spacer. That sounds excessive to me.
It has a billet 10" converter and a flywheel off a 4.8/5.3 I had laying around.
With a 1/4" of spacers that only leaves about a 1/4" of threads left on the ARP bolts I have to go into the converter pads.
1/4" is 4 standard flat washers.
And lots of aftermarket options. Some 4.8 stuff had a longer crank hub and thus needed a dished flexplate so that the same converter could be used in all applications...thus saving GM on converter cost and making it easy to swap around.
But...if you have a short hub crank...with a dished flexplate...you will get a huge gap. Like you have.
Again, this is all guessing from me, but I would say that you put the right flexplate on it and your gap will be correct
I don't think he is guessing at the facts he stated. I think he is more saying/ asking what flex plate do you have? Is it dished or flat? If dished get a flat one.....
I'm guessing because you've posted no pictures of what you have, nor do you seem to know which flexplate you have.
If you posted all the pertinent information, then I wouldn't have to guess
I'm giving advice because I've rebuilt enough transmissions, and installed plenty to have seen multiple combos, and what causes different problems.
but by all means...lets get snippy with the people helping you...im sure that'll solve the problem
Jokes aside tho, to the O.P. we all are just here to help. If you can get some more info on what you are using, and maybe pictures of the flexplate, crank hub, converter, and bellhousing...you should get a pretty straight answer and clear direction
So after more research there only appears to be 2 flex plates possible from the OE. Dished or Flat. I thought maybe i had managed to find a odd offset dished flywheel but from what I have found they don't exist. After calling the vendor I bought the converter from and explaining my issue they told me what the total high the converter should be (6.525''). After knowing the flex plate was correct and it was highly unlikely there was a issue with my pump on the transmission I pulled the trans and yanked the converter out and measured total height. Measures out be almost exactly 1/4" too short. I'll be sending it back.
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4L60E converter spacing (big gap) 
