I have a fairly new-old-stock Bachmann GP-40 that has a problem with the powered back truck assembly. When I got the unit out of the box for the first time ( I don't remember if I bought it years ago or inherited it from my dad ) it ran for a minute and then it lost drive to the wheels on the back/powered truck. I took it apart and there was a lot of lubrication oil on the entire drive shaft assembly. It took several cleanings until it would stay together; however in the process I think I somehow damaged the assembly as now the front axle of the drive truck is slightly higher than the rear axle (see photos) and it frequently derails. I tried taking it apart and reassembling it. If I get it loose enough that it sits level, when I stop the engine, the rear axle on the drive truck derails to the right. If I tighten up the assembly to where the truck sits level, it's too stiff to navigate the curves. If I run the engine in reverse, where the powered truck is leading, the engine runs fine. Any idea what I've done wrong and/or can remedy the problem ?
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