MTH scale wheel coupler question

You can only use kadees. The hole in the pilot will not accommodate  a lobster claw. Also, the fixed pilots are set up for body mount couplers, not the truck mounted 3 rail lobster claws.

I would convert 1 end of 1 car to a kadee so you can couple it to the engine. A GP38 is short enough that you can probably get away with 054s and kadees. Try converting a 40ft boxcar so there’s not much distance between the truck pivot and the coupler. Be prepared to experiment a little bit. You may need to use the longer shank 746 coupler on the rear end to space the car away a little more and get a bit of extra swing.  

Otherwise, if you really have to have 3R couplers, just pass on it.

After doing a little research it seems like going with the kadee 740 series couplers would be better then the 804 or 805 couplers and gear draft boxes. Would I be right in thinking the 745 coupler and gear box would be what I need or should I go with a longer shank untill I can get O-72 curves?

   Steve