If you have modified your engine, or your switch is not functioning, or just plain missing you’ll need to get a switch kit from B&M, or Lokar. You can skip down to wiring part of this article. If you are still running a Q Jet carb and have the original switch that functions, you’re in luck. We dug out the original intake, Q Jet and switch with it’s bracket then put them together again so you can see how they were on a stock big block. This is the kick down switch and it’s bracket that came on our Caprice when we bought the car. We then tried bending the switches bracket in order to use it with the Holley carb, but turned out to be futile because the Holley’s linkage didn’t have the right pad on it, and the switch didn’t work anyways.
We took off the QJet carb almost immediately after we bought the car, replacing it with a Holley carb. This switch has a wire going down to the transmission to a detent solenoid inside the transmission that caused the transmission to drop down a gear below 70 mph. There was a pad on the QJet’s linkage that hit a push button on the switch when you got the throttle wide open. Originally, our Caprice’s LS4 454 came with a Quadrajet carb and the kickdown switch was on a bracket on the driver’s side rear of the carb behind the linkage. We haven’t even had the switch connected most of that time.
We’ve had this car for nearly a decade and it’s never worked. We are going to try to take some of the mystery and scariness out of fixing the kickdown switch on our 1970 Caprice with it’s 454 and TH400. But, GM’s TH400 uses a combination of vacuum line at low speeds and an electric switch at speeds above 30 mph. TH350s use a cable connected to the carb linkage, 700R4’s use TV cable, Ford C’4’s have a rod, and Chrylser’s Torqueflite used a cable as well. Nearly every automatic transmission has some kind of kick down apparatus and they are all different.
0 kommentar(er)
