I have a 1989 electric club car, 36 volt, in need of batteries and tires. As you know they're pretty slow. What would be my best bet to improve speed. I thought about maybe lifting and bigger tires as well. Would new 36 v. batteries alone keep up with bigger tires or would I need an upgraded motor or is it possible to change to 48 v. If I did go 48 v. then would I have to change controller, motor, etc. Thanks for your help.