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Old 09-18-2006, 01:11 PM
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Car Craft and TH400 article

As usual, I am always looking for a better time slip. An article in this months Car Craft is talking about TH400s, ways to set them up, etc. One thing they talk about is kick down solenoids, and how they hold each gear allowing the governor to make the shift points, and the solenoids raise the line pressure also. My tranny has not had any kick down hooked up in the 8 years I have owned and modified it. At the track I just manually shift while watching the tach to hit my shift points. Question here is: Would using a kickdown solenoid and increasing line pressure result in firmer shifts and a better ET? Tranny already has a shift kit and a 3000 RPM Hole Shot converter with the modulator valve screwed in around 6 turns as I recall. Any thoughts from you tranny gurus out there? It would be a cheap investment just to try I suppose, might make a nice little wintertime project here in the near future. Thanks in advance, Larry

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Old 09-18-2006, 07:59 PM
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If you are shifting manually, there is no additonal line increase due solely to the detent solenoid circuit activation. The solenoid affects line in drive position when the solenoid is activated. This does increase road speed and RPM before the upshift.
Most valvebody kits address extending max RPM upshift when using manual ranges regardless of solenoid activation.
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Old 09-19-2006, 11:23 AM
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Thanks for the reply, I wondered if it would make any real difference, when I'm shifting manually anyway. Don't know if you don't ask! Auto trannies are still one of the most mysterious parts of a car to me, and I'm always asking questions and trying to learn more. Seems the potential to go faster is there if a person knows how to go about getting it, and I'm always looking for more speed!
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