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
     

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  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
  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.
     
  8. Canadian GS 350

    Canadian GS 350 Well-Known Member

    E9B0EFC0-B767-43A1-A3D7-740B3584EED9.jpeg Got the tranny back today. So I’ll paint it aluminum. Kyle, I ordered the t400 energy brake cable - both the front and the intermediate from inline tube. I ordered a turbo 400 tranny mount. I will be modifying the turbo 350 crossmember to accept the emergency brake cable for the turbo 400. There is a good article on Buick performance showing the differences in the cross members. I have a turbo 400 gas pedal and kick down. Here’s a couple pics. You can see the reinforcements in the bell housing and the extra material in the pan area as was pointed out by another member.
     

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  9. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Guys - what are your thoughts on using type F tranny fluid? I will be adding a cooler and the TSP 9.5 converter.
     
  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

  11. Bens99gtp

    Bens99gtp Well-Known Member

    I use F in mine, no issue, converter guy requested it says it give a more true flash. I cant say one way over the other
     
  12. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Looking at my tranny cooler kit, it has barbed hose connections with hose clamps.
    Is this a satisfactory method to plumb this cooler in? I’m not sure I like barb and clamp?

    Thoughts?
     
  13. 1969RIVI

    1969RIVI Well-Known Member

    I've had mine on for 2 years with not a drop leaked or a single problem at all.
     
  14. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Painting the tranny cast aluminum on Thursday.......hope it doesn’t look to disco! I’ll keep the paint to a light coat.
     
  15. 1969RIVI

    1969RIVI Well-Known Member

    If you want to know how it will look 20190621_213321.jpg here ya go!
     
  16. Canadian GS 350

    Canadian GS 350 Well-Known Member

    That looks awesome. I’ll try to duplicate
     
  17. 1969RIVI

    1969RIVI Well-Known Member

    Here's the paint and colour code that 20200122_210506.jpg 20200122_210446.jpg I used.
     
  18. 1969RIVI

    1969RIVI Well-Known Member

    It does look really good in person too! I made sure I cleaned the case extremely well before painting it. I used a can and a half on it. Basically 2 light coats and 2 heavy coats and no primer. I taped off all the openings to the internals where you don't want paint getting into. I did it while the case was empty, strung it up from a piece of heavy tie wire so I could get all the way around it evenly.
     
  19. Canadian GS 350

    Canadian GS 350 Well-Known Member

    I have the same exact paint....I’ll post when done.
     
    1969RIVI likes this.
  20. 1969RIVI

    1969RIVI Well-Known Member

    Look forward to seeing it:)
     

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