RE: 3 speed kit problems or not?
I've attached a picture of the three speed. I've drawn
an arrow pointing to a black disk which you have to remove along
with the output shaft to install the reverse module.
I had the same problem last year that you're having now.
When you put the reverse module in this half
of transmision be sure to press it clear in. At least that was the
problem I had and it caused the tranny not to spin freely.
After squeezing the reverse module and that half of tranny case
I heard it click in and transmision then spun freely.