TH400 Kick Down RPM Adjustment?

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pitts64
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TH400 Kick Down RPM Adjustment?

Post by pitts64 » Sun Jun 28, 2015 8:51 am

I have a mildly beefed up Turbo 400 behind my Pontiac 462, this car is all street. It has a Trans Go shift kit, Continental 13" converter and a CK Performance 2.75 first gear set.. I'd like to leave the electric kick down solenoid connected but when I do it will shift too late during full throttle.. With the solenoid disconnected, it will shift around 3500-4000...

How do I adjust this? Slow the flow at the solenoid orifice?

Thank you,
Jeff

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Alan Roehrich
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Re: TH400 Kick Down RPM Adjustment?

Post by Alan Roehrich » Sun Jun 28, 2015 10:52 am

Shift points are controlled by the governor and to a lesser extent, the vacuum modulator. The detent solenoid is either on or off, and you'd be better off not to try to play around with the orific.

Personally, I use either an ATI valve body, or either the Superior or the Fairbanks valve body kit.

You can then use the governor weights to change the shift points. The lighter the weight, the higher the shift point.

pitts64
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Re: TH400 Kick Down RPM Adjustment?

Post by pitts64 » Sun Jun 28, 2015 11:49 am

Thanks Alan... I'll pick up another governor that I can modify...

What gets me is I have almost 3 grand into this trany now including the last rebuild.. With 25,000 street miles, I would think they would last a little longer. The motor puts out about 500 lbs @ 420 hp when occasionally called on... I should of just had a whole new unit built for heavy street use..

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Alan Roehrich
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Re: TH400 Kick Down RPM Adjustment?

Post by Alan Roehrich » Sun Jun 28, 2015 1:23 pm

pitts64 wrote:Thanks Alan... I'll pick up another governor that I can modify...

What gets me is I have almost 3 grand into this trany now including the last rebuild.. With 25,000 street miles, I would think they would last a little longer. The motor puts out about 500 lbs @ 420 hp when occasionally called on... I should of just had a whole new unit built for heavy street use..

Wow. Three grand is a ton for a street TH400.

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