Converting Westinghouse Marketeer to Gas

[Doug7200]

I'll post a picture soon, but I have a Marketeer model 4 36 B. It is 4 wheel, 36V. It looks like a little Jeep or hummer. Kind of square and all steel. It was once street legal in Sun City so it has bumpers, lights, horn and it's all there and in good shape. I converted it to an Alltrak solid state system with 6 new Trojan batteries, b ut it still is kind of wimpy in the hills around here. So... I want to convert it to gas. I'm tracking down a transaxle and axle tubes but am not sure if Yamaha or EzGo would be best. Any ideas out there? Thanks