What the heck is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crakarjax · 01-26-2010, 01:29 PM

This came zip-tied to my firewall and I don't have a factory assembly manual yet (cheapest place to get one?). Can anyone identify this for me? Thanks!

Phlebmaster · 01-26-2010, 01:32 PM

That is kinda hard to see, could you get a closer picture by chance?? Looks like some sort of switch to me from what I can tell.

You can pick up a Chilton's or Haynes manual at your local auto parts store for around $19.99.

**Classic Heartbeat** · 01-26-2010, 01:56 PM

Well what it looks like to me is a factory T-400 kick down switch and bracket. Just not located where it is sopposed to be. Someone could have wire tied it there so they wouldn't loose it..

WES

**CPNE** · 01-26-2010, 01:58 PM

Does it look like this? th400 kickdown

crakarjax · 01-26-2010, 02:41 PM

Quote:

Originally Posted by CPNE

Does it look like this? th400 kickdown

Yes! It is missing the rubber seal on the end though. Thank you good sir! Now, can anyone tell me whether I want to use the kickdown? It does have a TH-400 trans, but the kickdown is missing on my other vehicles th-400 and I have noticed no ill effects.

Sinister · 01-26-2010, 03:18 PM

A working kickdown switch makes flooring it a little more pleasant.

marcsRX · 01-26-2010, 03:28 PM

Quote:

Originally Posted by Sinister

A working kickdown switch makes flooring it a little more pleasant.

Please esplain!

Sinister · 01-26-2010, 03:31 PM

Quote:

Originally Posted by marcsRX

Please explain!

When you floor it with a working kickdown switch the transmission automatically downshifts if your already rolling. I think it also holds first gear longer if starting out from a stop, but don't quote me on that.

crakarjax · 01-26-2010, 03:32 PM

My tranny downshifts without a kickdown when I floor it. I thought this was the point of the vacuum modulator?

Sinister · 01-26-2010, 04:15 PM

Quote:

Originally Posted by crakarjax

My tranny downshifts without a kickdown when I floor it. I thought this was the point of the vacuum modulator?

Don't know how it could do that without a functioning kickdown. Are you sure you still have a TH400 installed in the truck?

crakarjax · 01-26-2010, 04:26 PM

Quote:

Originally Posted by Sinister

Don't know how it could do that without a functioning kickdown. Are you sure you still have a TH400 installed in the truck?

This is in my chevelle. Might have a shift kit in it? Definitely TH-400 though.

Longhorn Man · 01-26-2010, 05:12 PM

A TH400 will kick down from 3 to 2 when you go wide open throttle regardles of the kickdown. However, the kick down switch will let it drop to first if the speed isn't too high.
If that was all it did, then I'd say screw it. however, it permits holding first a bit longer when nailing it from a stand still, and it also increases the line pressure and helps with clutch life.

01-26-2010, 01:29 PM	#1
crakarjax Registered User Join Date: Dec 2009 Location: Kirkland, WA Posts: 1,302	What the heck is this? This came zip-tied to my firewall and I don't have a factory assembly manual yet (cheapest place to get one?). Can anyone identify this for me? Thanks! Attached Images __________________ 1968 LWB C20 / AC / Wood Bed

01-26-2010, 01:32 PM	#2
Phlebmaster Registered User Join Date: Nov 2009 Location: Oregon City, OR Posts: 146	Re: What the heck is this? That is kinda hard to see, could you get a closer picture by chance?? Looks like some sort of switch to me from what I can tell. You can pick up a Chilton's or Haynes manual at your local auto parts store for around $19.99. __________________ Thanks, Aaron Life is about making dreams come true, stop dreaming and make life happen. 64 GMC Project MY_YOUTUBE_VIDEOS To keep an opened mind- speculation is devine. Assumptions always lead to a dead end! Last edited by Phlebmaster; 01-26-2010 at 01:34 PM.

01-26-2010, 01:56 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What the heck is this? Well what it looks like to me is a factory T-400 kick down switch and bracket. Just not located where it is sopposed to be. Someone could have wire tied it there so they wouldn't loose it.. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

01-26-2010, 01:58 PM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Re: What the heck is this? Does it look like this? th400 kickdown Attached Images __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

01-26-2010, 03:18 PM	#6
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: What the heck is this? A working kickdown switch makes flooring it a little more pleasant. __________________ Beat it to fit, Paint it to match...

01-26-2010, 03:32 PM	#9
crakarjax Registered User Join Date: Dec 2009 Location: Kirkland, WA Posts: 1,302	Re: What the heck is this? My tranny downshifts without a kickdown when I floor it. I thought this was the point of the vacuum modulator? __________________ 1968 LWB C20 / AC / Wood Bed

01-26-2010, 05:12 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: What the heck is this? A TH400 will kick down from 3 to 2 when you go wide open throttle regardles of the kickdown. However, the kick down switch will let it drop to first if the speed isn't too high. If that was all it did, then I'd say screw it. however, it permits holding first a bit longer when nailing it from a stand still, and it also increases the line pressure and helps with clutch life.



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