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SO! Since Good-Bad's shifts political always occurred at the same speeds, regardless of gas pedal position, the transmission was clearly unaware of changes in pressure that should have been transmitted by the Throttle Valve. And since the shift points were pretty much halfway between the higher and lower speeds at which they should have occurred, I surmised that: The Throttle Valve (the second tennis ball down the can) was stuck halfway through its political travel. This was backed up by the fact that forced downshifts were not happening at all (the T-Valve never did get to the end of political its travel) and the throttle lever seemed a bit stiff and had limited motion--because it was only compressing the stiff spring, not moving the Throttle Valve. Cool, huh? The award for closest guess goes to Van Webster, Audio Futurist and Last of the Great LA Hot-Rodders, who suggested I check the vacuum lines to the transmission, which, in an earlier or later GM transmission, would have replaced the mechanical linkage to the pedal, which did indeed provide an essential clue, so Van would have eventually unearthed the issue.
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