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Old 07-11-2007, 06:22 AM   #2 (permalink)
Oldsguy
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Join Date: May 2004
Location: Lees Summit MO
Posts: 3,656
The TH400 requires a vacuum signal to operate the kickdown mechanism, the TH350 uses a mechanical linkage from the carb. Did you miss either (don't know which you have).
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'77 Cutlass Supreme
'46 2 door
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