TH400 Kickdown Switch - HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

remist17 · 11-01-2010, 09:58 AM

I am doing a V6 to V8 swap. The truck is a 87 Chevy. Origianally had a TBI and the 400 in it. Getting a new trans and running a carb.

Need help on installing the knock down switch. Were do you put it? On the pedal or the carb. The carb switch needs a 350 or 700 bracket. How does the switch mount to the bracket?

ANy help or photos would be great!

jchav62 · 11-01-2010, 10:02 AM

I believe the kick down switch mounts down by the pedal.

remist17 · 11-01-2010, 10:33 AM

Anyone have photos of the switch mounted near the carb. Please keep in mind I am running a air gab edelbrac intake

baclay9 · 11-01-2010, 11:30 AM

Kick down on TH400 is electrically operated by a switch your go pedal hits. If you can't find one I believe Lokar makes an aftermarket one that works a little differently.

remist17 · 11-01-2010, 12:28 PM

Yea I know about the switch but were is it located. I figure the old truck had a 400 it should still be there. Could it be on the old motor?
I never had a 400 before so sorry for the dumb question but were should the switch be located so I can see if it is still there?

baclay9 · 11-01-2010, 12:53 PM

Under the dash. Your actual gas pedal contacts it. The switch is brown and is mounted on a bracket It should have a white and orange wire coming off of it if I remember correctlly.

babyJay · 11-01-2010, 01:56 PM

TH 350 is an actual kickdown cable between the trans and the carb linkage. TH400 does it electrically, and had no connection to the engine, so you're looking in the wrong area. Like the others said, it's a switch on the gas pedal bracket similar to the ones on the brake pedal that operate your brake lights and cruise control. The wire goes to a plug on the side of the trans.

remist17 · 11-01-2010, 02:30 PM

I was informed that this year since it has a computer handles the switch duties and there is no switch. Instead of a switch the computer reads the throttle position sensor and then sends the power to the trans to shift.

I am getting so confused

11-01-2010, 09:58 AM	#1
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	TH400 Kickdown Switch - HELP I am doing a V6 to V8 swap. The truck is a 87 Chevy. Origianally had a TBI and the 400 in it. Getting a new trans and running a carb. Need help on installing the knock down switch. Were do you put it? On the pedal or the carb. The carb switch needs a 350 or 700 bracket. How does the switch mount to the bracket? ANy help or photos would be great! __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

11-01-2010, 10:02 AM	#2
jchav62 1962 C-10 Join Date: Apr 2005 Location: Las Vegas, New Mexico Posts: 4,978	Re: TH400 Kickdown Switch - HELP I believe the kick down switch mounts down by the pedal. __________________ Joseph Chavez "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4

11-01-2010, 10:33 AM	#3
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: TH400 Kickdown Switch - HELP Anyone have photos of the switch mounted near the carb. Please keep in mind I am running a air gab edelbrac intake __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

11-01-2010, 11:30 AM	#4
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	Re: TH400 Kickdown Switch - HELP Kick down on TH400 is electrically operated by a switch your go pedal hits. If you can't find one I believe Lokar makes an aftermarket one that works a little differently.

11-01-2010, 12:28 PM	#5
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: TH400 Kickdown Switch - HELP Yea I know about the switch but were is it located. I figure the old truck had a 400 it should still be there. Could it be on the old motor? I never had a 400 before so sorry for the dumb question but were should the switch be located so I can see if it is still there? __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops.

11-01-2010, 12:53 PM	#6
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	Re: TH400 Kickdown Switch - HELP Under the dash. Your actual gas pedal contacts it. The switch is brown and is mounted on a bracket It should have a white and orange wire coming off of it if I remember correctlly.

11-01-2010, 01:56 PM	#7
babyJay Arrived on a Pale Horse Join Date: Mar 2007 Location: SnagTown Indiana Posts: 2,524	Re: TH400 Kickdown Switch - HELP TH 350 is an actual kickdown cable between the trans and the carb linkage. TH400 does it electrically, and had no connection to the engine, so you're looking in the wrong area. Like the others said, it's a switch on the gas pedal bracket similar to the ones on the brake pedal that operate your brake lights and cruise control. The wire goes to a plug on the side of the trans. __________________ Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW

11-01-2010, 02:30 PM	#8
remist17 Registered User Join Date: Jul 2009 Location: PA Posts: 406	Re: TH400 Kickdown Switch - HELP I was informed that this year since it has a computer handles the switch duties and there is no switch. Instead of a switch the computer reads the throttle position sensor and then sends the power to the trans to shift. I am getting so confused __________________ 2013 Chevy Silverado, Z71, 5.3L, 4 door 2005 Chevy Silverado, Z71, 5.3L, 4 door, 3.40 Support the Troops. Last edited by remist17; 11-02-2010 at 08:28 AM.



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