wave1957

Still trying to put a 4L80E on an LQ9! I have changed the flexplate to get the right number (6) of bolt holes.

(12551367 Flexplate. This is the flat flexplate used on 6.0/4L80E applications.
12563532 Flexplate spacer. This goes onto the crankshaft first, followed by the flexplate.
12563533 Bolt (6 req.) These are the longer crankshaft bolts needed because of the spacer is what I have used).

Now, I have another issue: the converter was not touching the flexplate as I brought the trans case against the engine block, there was about a 1/2" space, so I had to pull the converter "out" of the trans to bolt it to the flexplate. Is this right? Have I disengaged the converter from the trans by doing this? I remember seeing somewhere that there are 2 thicknesses 4L80E converter, does this mean I have the thin one and need the thick one?

WE TODD DID

iTrader: (2)

1/2" is way too much. Its not even engaged into the pump gears with that much backspace. You don't really want anymore than about 3/16". I've seen 1/4" fly, but I don't like running them with that much. You don't have the flexplate flipped around, do you?

wave1957

No, it is not flipped around, it says "engine side" on it, and it is pretty flat anyway.
What about converter thickness? Do I need another converter?

WE TODD DID

iTrader: (2)

To my knowledge, I think there is only one thickness 4l80 converter. You may have a flywheel issue going on.