904 Transmission issues.

If your not feeling the detent when you shift through the gears it could very well be a problem with the internal shift linkage like GJ said. That's the first place I'd check. Drop the pan and have a look at it.

I still haven't found any info on the TF-3 kit to comment on the throttle pressure linkage. Can't seem to get their library to pull up and didn't have time to call them today.