Called the local Train Shop and they had one package of these couplers left!  I had them set them aside & drove over that afternoon to get them.  You may be able to see the cracks in the two couplers on the worm gear shafts.  They come off their shaft's with very little effort (since they are cracked).  Easy fix now since I have the new parts.  Emailed Athearn asking if they by chance had the sideframes I need for the SW7.

Took apart one truck of the SW1500 cow and indeed the sideframes are cast with the number 70702 just like the sideframes of the unpowered loco.  The powered SW1500 sideframes have bronze wheel/axle bearings instead of the black plastic bearings on the unpowered sideframes.  Will remove the Ernst gearing and go back to the original stock Athearn gear set.  Next up is the motor.  Did not remove the flywheels as I was afraid that they might slip on the shaft after removing and replacing.  Cleaned the commutator with a fine flat small file and a pencil eraser + #11 blad