I was able to convert my car to 2R and install Kadee 745's with no issues. In a nutshell here is what I did
- Remove the 5 screws which hold the main car body to the flat car, 2 on each end and one in the center of the car inside the secret compartment in the center sill
- Remove the 5 screws on each end which hold the swing coupler assembly, and pull the whole coupler assembly off the car. I positioned the coupler in the center and gently rocked it back and forth until it came out easily
- With the main car body and the flat car seperated, I popped out the lionel insert for the truck screw
- I installed the plastic insert that comes with the Atlas 70ton trucks and attached the Atlas trucks to each end
- I laid the Kadee gearbox top cover on the bottom of the car , the lip flush with the end of the car, and marked the center hole. Once both ends were marked, I drilled and tapped a hole for a 2-56 screw
- Assembled the Kadee gearbox and coupler and attached the couplers to each end
- Reassembled
Here are some photos of the conversion