I as told that my 4L80E in my '02 2500HD was similar to a TH400 transmission, but with an overdrive. I have a stall for a TH400 and was wondering if the input shafts were the same on both the 4L80E and the TH400 transmissions. If so, I'm assuming that I can use that stall.

 

No, it will not work they are different. Brad.

 

Thanks alot. Time for a fuddle.