Hello all, I am hoping someone can help me with an issue I am stuck on with my 772.4 auto transmission on my 1988 190e 2.6

I recently installed a working transmission from a friends car who preformed a manual swap, I installed it, had some issues with gears activating which was fixed after pouring through a lot of fluid and disassembling and cleaning the valve body.

I now have an issue where the car engages very late at 3000 RPM at (third?) and does not want to upshift from I believe third? P N D R 1-2 work fine and the throttle response is perfect but as soon as I enter third its very delayed and will not upshift despite being up too speed or almost redlining it.

I have checked all the fuses, switch behind gas pedal, and transmission shifter cable on the throttle body which seems to be in tight working order.

Any suggestions to fix? I asked around and did some research and people have suggested the torque converter being empty, defective kickdown solenoid, or defective governor assembly.

Any pointers or suggestions would be extremely appreciated, my next moves are to check torque converter for proper fill level and replace the solenoid.

I think there is a filter screen on the rear valve body piece which causes this. Or you have a stuck governor.

Do you get all other shifts at normal rpm and load?

Adjust modulator per manual. If that doesn't work, inspect the governor. http://www.w124performance.com/docs/mb/transmission/trans_722.3-722.4_ATSG_complete.pdf

loosen the cable, could be too tight.

I have actually disassembled the rear valve body and cleaned it, no clogged filters, are you referring to the plastic governor gear? It looks brand new and does not move freely by hand which I was told is optimal all other shifts seem normal and OK

I adjusted back and forth the Bowden cable from the engine bay as well as completely disconnecting it. No change