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Thread: New member

  1. #1
    Carb and Points!
    Join Date
    Oct 2015

    New member

    Thanks for adding me. I have a 1984 motorhome with a 454 in it that I will be converting to tbi this winter. If that works out my 1978 dodge d200 with a 440 is next. I have owned/rebuilt a few small block suburbans with tbi so I am a little familiar with the system. My first question is, what year donor vehicle should i look for. My motorhome has a th400 trans and I dont know if the pcm from a later tbi can be used on a non electronic shift 3 speed. Thanks

  2. #2
    Fuel Injected!
    Join Date
    Jul 2012
    Fresno, CA
    Yes, there's no problem using a later ECM with a non-electronic transmission. For best drivability, you'll want to use a VSS adapter so the ECM will know when you're accelerating/cruising/slowing/stopped, but you can get away without it if you need to.
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  3. #3
    Carb and Points!
    Join Date
    Oct 2015
    Thanks for the info. I plan on using a vss sensor to help driveability. My motorhome is old enough that it doesn't need to be smog tested so I can do what ever I want to. Driveability/reliability are first followed by performance then mpg. I doubt I will see any improvement in mpg. I do expect better performance with air pump removal, headers, and tbi.

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