On your TH400 question, I think there is normally a switch on the carb. or linkage that completes a 12v. circuit under full throttle. There is an electrical spade connection on the trans that activates an internal solenoid.
Have a look at some of the speed shops like Summit or Jegs for replacement linkage.
__________________
2014 Newmar Ventana 4037 / 4018
2015 Jeep Grand Cherokee Ltd.
1940 Chevrolet Pickup
|