904 question

“Part throttle kick down” ?!?
I’ll research what that means even though it sounds pretty self explanatory.
I have a 66 formula s I was thinking about robbing the trans for on my build in the shop. I rebuilt a 74’904 2 years ago and put it in a rebuild of my other 66 after a very complete and I do mean complete car overhaul.

In the valve body I put a shift kit and a deep oil pan. It’s acting flakey for its initial trials so I was going to swap out the valve bodies to see if it was valvebody or trans related. It could even be suction side of filter. Deeper pan has a filter extension that could be leaking provide fluid only under high revs. I have no movement at lite throttle, it will shift thru gears but only on the lift. On the ground I need to get to 2000rmp before the car will slide fwd like it has a trans brake... and it does not.

It’s going to be something simple. I need to double check the kick down cable (I went lokar cable over linkage to save space for larger exhaust). Maybe the adjustment slipped. When I pull the valve body I can re air check trans for leakage.