TH400 kickdown wiring

Discussion in 'Sparky's corner' started by rh455, Oct 5, 2002.

  1. rh455

    rh455 Well-Known Member

    5. The gas pedal and retaining plate will need to be changed since the TH350 uses a cable downshift while the TH400 uses an electric solenoid. All cars are pre-wired for a TH400 and if you look closely above the gas pedal you should see a yellow wire and black wire going into a plug. The yellow wire comes from the power supply from the radio. If yours is missing, all you need to do is run a power wire from the fuse box marked ign and then a wire to the TH400. Go to the salvage yard and get the necessary wire from any full size Buick, Olds or Pontiac since almost all of them came with longshaft TH400s. All 1968 A-bodies have the TH400 downshift switch and gas pedal regardless if they have the TH400. So, get the set-up from the 68s since the 69-72 have the set-up on if they came from the fact with a TH400 which is usually in station wagons and muscle cars. These are typically not in the salvage yards. Below is a pic of a set-up from a 1968 A-body minus the wiring. The second pic shows it installed on the gas pedal. Article by George Nenandovich.



    I found the two yellow/one black w/white tracer that goes to the switch. Now which wire runs to the solenoid on the transmission? The donor car that I pulled the solenoid wire from had a red wire to the solenoid. This is a 4spd car so it has nothing. What do I connect the solenoid wire to?
     
  2. rh455

    rh455 Well-Known Member

    here's the plug to the switch

    The donor car had one yellow and one black w/ a white tracer. The plug in the car has two yellow and one black w/ a white tracer..........
     

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