Turbo 350 or Turbo 400 for my GS?

Discussion in 'The "Juice Box"' started by Canadian GS 350, Dec 15, 2019.

  1. Tomahawk

    Tomahawk Gold Level Contributor

  2. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Kyle - I found the plug under the dash. I don’t think there is any wiring on the fire wall for the turbo 400 kickdown as our cars are turbo 350 born. I’ll wire from the switch at gas pedal to the turbo 400. Ordered my turbo 400 emerge brake cable etc from inline tube today and picked up a turbo 400 trans mount. Tranny should be ready next week.
     
  3. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    I could be wrong but you should only have to plug the plug into the pedal solenoid.

    Even with my TH350 I have a plug that goes to the transmission. I may be totally incorrect though.

    Kyle
     

    Attached Files:

  4. Canadian GS 350

    Canadian GS 350 Well-Known Member

    I think it’s the transmission controlled spark wire on the turbo 350
     
  5. '72 Skylark Custom 4bbl

    '72 Skylark Custom 4bbl Well-Known Member

    Ahh yes. My bad. I’m wondering about that firewall wire no myself.

    I’ll be doing a TH400 swap myself here in the future.

    Kyle
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    There is a spot for it on the engine harness side, even if there is no wire currently there, you can add it with the proper Packard 56 terminal.

    Packard56.jpg
    You just have to hook it into the right spot on the engine harness firewall connector. Kind of hard to see, but it looks like the lower right side corner of the connector, right next to the purple solenoid wire.

    KickdownWiringTH400.jpg

    Or, you can just run your own wire through the firewall.
     
    Last edited: Jan 16, 2020 at 10:50 AM
  7. Canadian GS 350

    Canadian GS 350 Well-Known Member

    For now, I’m going to wire through the firewall myself. I think when I put the 455 in, I will purchase a 455 turbo 400 engine wiring harness- which should come with this connection to the tranny.
     

Share This Page