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Does the Speedometer control the shifting?

This is a discussion on Does the Speedometer control the shifting? within the Camaro / SS forums, part of the Vehicle Specific category; We installed the entire drivetrain (engine, tranny and rearend) from a 2002 Camaro into a 1955 Chevy pickup. It runs ...

  1. #1
    Junior Member
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    Aug 2008
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    Brown/White
    1955 Chevy 3100 Pickup

    Does the Speedometer control the shifting?

    We installed the entire drivetrain (engine, tranny and rearend) from a 2002 Camaro into a 1955 Chevy pickup. It runs like a champ except for one thing: When cruising, the tranny doesn't want to stay in overdrive, it keeps downshifting into the lower gear, and then hops back and forth between the lower and higher gear. If I put a load on the gas pedal, it shiftes down and stays there, put when I let off a bit to simply cruise, it goes back to up-down-up-down shifting.

    The computer is programmed stock and is programmed with the correct tire rollout.

    The transmission shop suggests the computer is not getting the correct info from the Auto Meter speedo, and he suggests that a change in the differential would solve the issue.

    Does this make sense to anybody else?

  2. #2
    James Bond Spikito's Avatar
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    Aug 2007
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    2001 3.8 Black - sold
    2000 SS Black M6

    not really, lol, mine will do this if im trying to cruise at about 50. thats like, top of 3rd, bottom of 4th, while im driving my rpms jump back about forth between 1500 and 1900, if im on the gas itll go into 4th, when im off back into 3rd. but like i say, only if im trying to stay at that speed.

  3. #3
    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
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    Black
    383 Procharged & N20 Vert

    Yes, shifting is controlled by speed and RPM

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