help needed with 904

Years ago I installed a Transgo on a904 I was hopping up. The kit was combo kit offering TF1,TFII, and TFIII capabilities, each one progressively harder shifting. The tricky thing was in the kit was a pair of little triangular plates that converted it from normal shifting into a full manual.
Well, I installed it as a full manual.
And not much time went by, and that plate got flipped back to semi-auto. The only difference between the TFII and III was this little plate as I recall. It must have been a governor block-off.
I loved being to hold it in any gear to any rpm, but I also loved to put in Drive and fugetaboudit.