I have a complete set of Golden Gate Depot Lehigh Valley heavyweight passenger cars that I'm wanting to convert to Kadee Couplers because of issues I'm having with the tinplate couplers.
My plan is to mount Kadee #805 coupler assemblies that I ordered from my local hobby shop. Does GGD provide holes in their car frames to mount the Kadee Gear Boxes, or do I need to drill and tap new holes into the frame? What size screw should I use to mount the gear box?