Engine will go in reverse, but wheels just spin going forward. Removed the armature and the botton bushing where the tip of the armature worm gear shaft sits in is worn and damaged. Thus, when the engine tries to go forward, centrifugal force is pushing the armature shaft away from the truck's worm gear so the two are not meshing and the wheels just spin. This repair is beyond my capabilities and comfort level --- I wouldn't know how to access it or drill out the remnants of the old bushing. Who do you recommend for repairing this MPC-era engine, preferably in-house rather than a business that farms it out to others.
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