Short version.

I have a 4.8 with the stock flex plate (slight dish in center)

Engine is out of car

I put the flex plate on- then the spacer with longer bolts. I put the TH400 converter up just to check fitment- the hub on the converter bottomed out in spacer and there was maybe 1/4 gap between converter and flex plate.


Took it all to local converter shop and he took several measurements and milled the GM spacer down slightly and now its fits correctly.

the converter was a standard height 6.2 TH400 converter

i installed it in the car tonight and checked the converter gap and it was perfect at 3/16 bottomed out in tranny and pulled snug to flex plate easily.



I guess my question is who has the GM spacer and did it fit correctly ?


I know originally these were used on the flat flex plate 6.0 applications but I thought there were plug and play for the dished 4.8/5.3 flex plates.

 

There's an acceptable range, and 1/4" is at the outside edge of it. Personally, I'd have done the same or more (I like 1/8"). Bottom line, you could have run it as-is and been OK.

 

no- not run as is- im not talking about the gap that the converter has in and out of the tranny,


im talking about just the converter pilot in the end of the crank spacer with no transmission-


Its fine after milling but deff didnt look right before

 

Never heard of that...

 

Bumping an old thread. Sounds like I'm having this same issue. May just have to mill down the spacer

 

Same here, had to mill 1/8 inch off my spacer. If you dont, it will bolt up, but on converter charge it can take out the thrust bearing.