Hi there, I have a older Hallmark E5 uint that I am trying to get to run on DCC with sound. I did a remotor on it but the tower gears are binding up and causing the u-joints couplings to slip on the motor shafts. The tower gears bind because of the way the bushings are worn. Anybody put under a new set of drive truck? Or whatever to fix? Thanks in advance. Sorry forgot to tell you this is HO scale.