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454 swap

Discussion in 'The Garage' started by jjmick, Feb 19, 2006.

  1. jjmick

    jjmick Registered Member

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    What all is involved in swapping a 2wd 454/700r4 into 83 3/4 ton with bad 350/700r4? Have both vehicles and buddy wants me to help swap the 454 into the 83. 454 is from a 80 2wd 3/4 ton. 83 is 4x4 with 700r4/208? any info or tips woulc be great. Thanks
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    First off, GM never put a 700R4 behind a 454 so if it indeed has a 700R4 someone swapped it in. If there is a 700R4 and it's a 2WD version then you would need to tear the tranny apart and swap the output shaft for the 4WD output as they're different. I'll bet the tranny in the 1980 2WD is a TH400 since it is in a 3/4 ton with a 454.
     
  3. jjmick

    jjmick Registered Member

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    youre right it is a th400 behind the 454
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    You would need to find a 32 spline t-case and adapter to fit a 4WD TH400 and then swap in the correct output shaft into the TH400 and then have a set of driveshafts made. So long as you have both vehicles then you will have everything for the engine swap.
     
  5. jjmick

    jjmick Registered Member

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    i guess i wasn't too clear. my buddy wants to uses the 454 with the 700r4 and rest of drivetrain. basically just swap motor so he has overdrive.
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Oh ok, that is easy then. Pull out the 350 and drop in the 454 with all of its accessories and a slight modification to the exhasut pipes and that's it. The 454 will drop directly in place of the 350 and it will bolt up to the 700R4 and work correctly. The only thing you need to make sure of first before swapping the engine in is that the flexplate has the correct bolt pattern for the torque convertor. Some flexplates only have one bolt pattern but most have a dual pattern and will work with no problems.
     
  7. jjmick

    jjmick Registered Member

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    Thanks for the help. that what i kind of thought but wasn't sure. Thanks again.
     
  8. chevyguybc

    chevyguybc 1/2 ton status

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    tranny sure wont be lastin`
     
  9. AZ_Overdrive

    AZ_Overdrive 1/2 ton status

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    What type of "slight modification" is necessary to the exhaust?

    Thanks,
     
  10. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Different size pipe and location.
     
  11. jjmick

    jjmick Registered Member

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    i should be able to use the collector at least from the 2wd or should i just go with headers and 2.5 dual exhaust.
     

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