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Thread: 4l80e change gear completely opposite to what it should

  1. #11
    Junior Member
    Join Date
    Apr 2014
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    16

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    After testing something more, it turns out that after running about 1.5 miles, the gearbox works just fine.
    Tried to just turn off the ignition and then start the engine right after then it works fine, but after stopping for 5 minutes to fill the tank then it has to run for 1.5 miles before it works right again.
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  2. #12
    Junior Member
    Join Date
    Apr 2014
    Posts
    16

    Default

    the reason for 4l80e switching quickly up to 4 gears ,was that the connection C2 16 and 19 on the PCM were grounded.
    so that PCM received signal that 4wd low range was enabled and front axle was engaged.
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

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