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727 torqueflite won't upshift

  1. All other classic cars
    Been working fine 1.5 years ( except for 2-3 flareup below) and out of the blue I went to return home after 1 hour cool down and it wouldn't upshift (1-2 & 2-3) until I lifted throttle. Linkage & throttle lever shaft function looks correct. Fluid level good. First & reverse fine. history...