BMW jetco gearbox E36 328

To whom it may concern
Between 1st to 2nd gear I get a kick from the gearbox. The rest of the gears are ok.The kick accures only on low RPM.In sport I get a kick and in economy.i have replaced the gearbox, and I still get the kick. i have replaced TCM(transmison Control module).And I still get the kick.I have replaced TPS(trhottle positioning sensor)And it is still kicking on low RPM.Please advise as to what i should do .To rectify the problem. Without selling the vehicle.
Thanks noiman