Re: TH350 mysterious shifting/not going into gear/freespin issue
Make sure your vacuum line is hooked up to the modulator. If it is not pulling vacuum it will take off and then loose power and not shift into upper gears. Other than that I would suspect fuild level
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'72 3/4 Cheyenne Super 402/TH400 Gear Vendors
'72 3/4 Cheyenne Super 350/200R4
'50 1/2 Chevy 3 Window
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