02-27-2021, 04:14 PM | #1 |
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Join Date: Oct 2016
Location: Austin, Texas
Posts: 306
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TH 400 help
My TH400 is not kicking down.
I have a Lokar kickdown switch all set up correctly. - I tested for 12 volts at the trans kick down connector. I put my volt meter on the spade and had my wife push the gas peddle down. At about 3/4 throttle I see 12 volts at the trans kick down spade. - I then tested to see if I could hear the solenoid in the trans. I ran a wire from the battery to the trans kick down spade, When I made contact I could hear the solenoid in the trans. I did it that way so I could eliminate all other noise. When I'm driving and in 3rd, I go to wide open throttle and it does not kick down to 2nd. The trans is new but I bought it second hand so I don't know if it's modified. Thanks for any help. |
02-27-2021, 08:52 PM | #2 |
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Location: Colfax-California
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Re: TH 400 help
At what speed are you trying to get passing gear?
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02-27-2021, 09:56 PM | #3 |
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Location: Austin, Texas
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Re: TH 400 help
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02-27-2021, 11:11 PM | #4 |
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Join Date: Dec 2009
Location: TN.
Posts: 8,213
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Re: TH 400 help
Is the Governer working freely?
Modulator valve okay? .
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02-28-2021, 12:27 AM | #5 |
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Location: Austin, Texas
Posts: 306
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Re: TH 400 help
I have the vacuum modulator hooked up correctly, but I don't know how to test it?
You have to educate me on the governor, I don't know anything about it. I was under the impression that the kick down solenoid was what down shifted the trans. Thank you. |
02-28-2021, 03:08 AM | #6 |
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Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: TH 400 help
If Governor Pressure is too high for a given speed.....it won't kickdown. If you tune the upshifts right.....Downshift timing will naturally follow suit.
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02-28-2021, 08:30 AM | #7 | |
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Location: TN.
Posts: 8,213
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Re: TH 400 help
Quote:
Mainly showing this for (An example) of operation. Link: https://www.jegs.com/p/B-M/B-M-Trans...51474/10002/-1 This lets you tune your shift points. If springs and weights are not working freely it will cause issues. There is also an adjustable modulator you can buy, If you don't have one already, Link: https://www.jegs.com/i/JEGS/555/6206...6%20Drivetrain It has a screw in the end where the vaccum hose goes. That screw is for (fine tuning) the shift points. Which is not your current issue. Once the shift issues are fixed this can help fine tune your shift points. Here is the a link I found on testing the modulator. So you don't have to read my (Long-winded) version Link:https://itstillruns.com/test-th400-v...-12179298.html Hope this helps .
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02-28-2021, 11:40 AM | #8 |
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Join Date: Oct 2016
Location: Austin, Texas
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Re: TH 400 help
Thanks G-Done
I believe all that info will help. I'll start reading and educating myself. |
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