The Ford Barn - View Single Post - Fordomatic late shifting ('57 thunderbird)

Dominic Hide · 10-17-2020, 09:43 AM

Just looked at your video. The spring is something added by a rebuilder to either compensate for worn governor or as a performance modification to do exactly what you are describing, late shifting. Reinstall it without the spring and your trans will shift normally. If the governor is worn the most noticeable consequence will be the trans will remain in high gear at a stop light and not change down until you start to pull away and fluid pressure is increased. Under this condition a helper spring can be used, but no where near as long as the one you have. A single tapered coil is plenty, and when compressed the wire should not lay on top of itself. (The spring under the float on a Holley 4000 carb is a good source from which to cut a coil)

ps the governor is installed in the correct position.

10-17-2020, 09:43 AM	#17
Dominic Hide Member Join Date: Jul 2010 Posts: 63	Re: Fordomatic late shifting ('57 thunderbird) Just looked at your video. The spring is something added by a rebuilder to either compensate for worn governor or as a performance modification to do exactly what you are describing, late shifting. Reinstall it without the spring and your trans will shift normally. If the governor is worn the most noticeable consequence will be the trans will remain in high gear at a stop light and not change down until you start to pull away and fluid pressure is increased. Under this condition a helper spring can be used, but no where near as long as the one you have. A single tapered coil is plenty, and when compressed the wire should not lay on top of itself. (The spring under the float on a Holley 4000 carb is a good source from which to cut a coil) ps the governor is installed in the correct position.