th400 kickdown detent switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cruiserman · 11-20-2007, 05:52 AM

What is the proper operation of the th400 kickdown detent switch mounted on the gas pedal ('72)? Mine does not move freely. I assume the gas pedal rod is supposed to push the switch to kickdown the tranny at high throttle? I can manually move the switch, but it will stick in that position.

If that's not correct, is it possible to clean it up?

thx, eric

dwaite72lnghrn · 11-20-2007, 07:30 AM

The switch should slid freely. There is a spring in it to push it back. Never tried cleaning but some crc 226 or electric contact cleaner should clean the switch.

Longhorn Man · 11-20-2007, 08:32 AM

it is avalible at the parts store, and I wouldn't be surprised if the dealer still had it too. They used it into the 90's on TH400 equipped P/30 trucks.

**1970cstblazer** · 11-20-2007, 09:03 AM

Part number 1242101 is still available thru GM. List price is $23.70.

cruiserman · 11-20-2007, 02:29 PM

Thanks for the replies. I'll see about replacing it.

I finally got around to replacing the throttle cable on my truck, and it's too long by about 1.5".

11-20-2007, 05:52 AM	#1
cruiserman Registered User Join Date: Dec 2006 Location: Idaho Posts: 210	th400 kickdown detent switch What is the proper operation of the th400 kickdown detent switch mounted on the gas pedal ('72)? Mine does not move freely. I assume the gas pedal rod is supposed to push the switch to kickdown the tranny at high throttle? I can manually move the switch, but it will stick in that position. If that's not correct, is it possible to clean it up? thx, eric __________________ 72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra

11-20-2007, 07:30 AM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: th400 kickdown detent switch The switch should slid freely. There is a spring in it to push it back. Never tried cleaning but some crc 226 or electric contact cleaner should clean the switch. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-20-2007, 08:32 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: th400 kickdown detent switch it is avalible at the parts store, and I wouldn't be surprised if the dealer still had it too. They used it into the 90's on TH400 equipped P/30 trucks.

11-20-2007, 09:03 AM	#4
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,827	Re: th400 kickdown detent switch Part number 1242101 is still available thru GM. List price is $23.70. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

11-20-2007, 02:29 PM	#5
cruiserman Registered User Join Date: Dec 2006 Location: Idaho Posts: 210	Re: th400 kickdown detent switch Thanks for the replies. I'll see about replacing it. I finally got around to replacing the throttle cable on my truck, and it's too long by about 1.5". __________________ 72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra

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