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I recently acquired an MPC-era GP9.  Very nice condition and runs great except for a noticeable front-end wobble. You can really see the top of the cab shake. It's the cab end with the motor and assuming there is something loose in the motor/truck arrangement. Was going to pull the shell and take a look but thought I'd check with any of the MPC experts here. Any insights/suggestions greatly appreciated.  Thanks.  

Original Post

The combination of casting/parting lines on the wheels, with rubber traction tires and overall light weight, adds up to the observations you are making.

 

You can fine-tune the wheels by truing them with a file/tool bit(as in a lathe - loco upside down in cradle - engine running) and replacing the tires with fresh, even ones, or the Stewart/Calumet 2505/192-2505 "Super Traction Tires".

Originally Posted by ADCX Rob:

The combination of casting/parting lines on the wheels, with rubber traction tires and overall light weight, adds up to the observations you are making.

 

You can fine-tune the wheels by truing them with a file/tool bit(as in a lathe - loco upside down in cradle - engine running) and replacing the tires with fresh, even ones, or the Stewart/Calumet 2505/192-2505 "Super Traction Tires".

Would it better if it replace truck assembly with good wheels?

The MPC trucks(wheels) are all the same. They aren't defective, just poorly designed/executed.  Some are worse than others depending on when & where they were made - the same basic wheels are still used on the starter set RS-3 diesels with the truck mounted DC motors.

 

You could replace the wheels with sintered powdered iron wheels from a postwar 200/600 series truck with or without the traction tire slots, or replace the whole power truck with a 600 series MagneTraction truck(the GE 44 ton trucks are a near identical cosmetic match).

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