Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Lengthening shift points in a TH350
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Old 12-26-2003, 11:57 PM
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WOT shifts controlled by govenor, modulator and vacuum have little affect on shift point. Part throttle shifts controlled by modulator pressure being overcome by govenor pressure, modulator and vacuum have large affect on shift point. Spring behind modulator valve will lower part throttle shift points as will turning out the screw in an adjustable mod. Turning in the screw or removing the spring (which is not stock and put in as part of some shift kits) will increase part throttle shift points. Detent cable on 350 controls kick down only, if stuck will cause late part throttle shifts but no effect on WOT shifts. If disconnected it can cause WOT shifts to be early but no other problems. If cable/detent valve isn't stuck and you have a good vacuum modulator, and good vacuum to it and still have concerns with your shift points, get yourself a govenor recalibration kit. Heavier springs and weights lower shift points and lighter springs and weights raise them. Springs have more effect on part throttle shifts and weights have more effect on WOT shifts, but both affect both shift points to some degree, so some trial and error will be required. Good luck.
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