Concerning Novaboys TH350 tranny, the throttle valve has to be positioned correctly no matter what the engine is or how it is set up..The TV has to know whats going on even while shifting manualy.The vacuum modulator is important also..It should be connected below the throttle plates as a rule..A replacement of quality that is adjustable is good for helping the shift points..Usually you st up the TV cable by holding the throttle wide open (not running of course) and have the TV cable extended all the way out so it just fits onto the carb linkage where it belongs..make sure the TV cable not kinked or broken..I remove them to be sure. The high ratio rear end will probably make the shift points different..
