I bought a stall converter for a 904 recently from CRT. It is a 26 spline as it will not go on the 27 spline I have. I tried it on a few cores I have and as tough as it was believe I counted 26 groves. They will not take the return, they said my transmission has been modified.
$800 down the drain and it sits in its box. If you figure it out let me know. Syleng1