You can buy GP-7 truck assemblies from Lionel part number 62085617404 and build up from there. I did this on a dummy GP-30 to put couplers, lights & LED's in with a ERR Dummy kit. It came with pickup rollers, coup;ers, axles and gearing. However, if you want full Legacy operation with motors & sound, then swapping the shell may be the way to go, but installing all the lights and LED's in that dummy shell can be a challenge. Charles Ro recently had the Legacy Polar RR GP-7 for $250. This may be the way to go if still available.
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