no there is not on a 4l80e.they were never designed to work a mechanical speedo. a 4l60e can be though. you would still need to have a way to send a signal so it knows when to shift (wont shift without a speed signal). so it would still need an electric speedo signal in order to work.
There was a mechanical speed-O conversion for a 4L80e trans some years ago. i do not know if they are still available. At the time they were in the 500 dollar $$ range.
I recall one brand came from TTS , The Turbo Shop. Dont quote me though, it has been a few years.
Thank you all. Looks like I have a bunch of options to try.
Wally
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