Ok here it goes.

I have a 1997 C36 I just purchased 1 month ago. The trans had issuse when I bought it and I bought the car at a desent price.
The tranny has a hard shift from 4-5, under hard acceleration. Under normal acceleration no hard shift. I have taken the trans
apart all clutches and fibers were in great condition, no burns in clutches,all seals good, no springs broken or valves sticking. No metal particals in tranny. I replaced the conductor plate,plug, filter and fluid. Reset adaptation. Drove the car and same problem. I hooked up the HHT and no codes. But the tranny has to much pressure under hard acceliration. Does anyone know what the problem could be? Please olny respond if you know what you are doing. I am lost at this point and I dont feel as if I need a new tranny its in too good of condition just to replace it with a new one and get shafted for $2960 for the trans.

Any help greatly appreciated!