A-833 Rapping

help

I recently installed an 833 4 speed in my 69 cuda, I believe it is out of a 67 car. The tranny raps / knocks in 1rst, 2nd, and 3rd gear but is fine in fourth. The rap does not change tempo as I speed up, but does get louder as I add more throttle / torque. I have tried to realign the tranny, could this be an alignment issue or linkage adjustment problem or is the tranny in need of repair. I have noticed the linkage rods are worn and need to be replaced. Looking for any advice on how to deal with this problem.

convcuda69