Th400 question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 11-01-2005, 12:08 AM

I have a th400 in my truck this is the first one I have owned all the rest had th350.

Anyway on to the question on the front driver side is a plug or sender with a male electric spade. Nothing is connected to it. What is it? seems to run fine with nothing hooked up to it?

Thanks

jhow66 · 11-01-2005, 12:19 AM

This is the electric kickdown for passing gear. A wire runs from this to a switch on the gas pedal bracket (on ones with cable operated gas feed) and then from the switch to a hot only with switch on to the fuse panel. On trucks that have a rod operated gas feed the switch is on the carb. Will try to find you pictures of the switchs.

jhow66 · 11-01-2005, 12:31 AM

Here is one for the cable ones-cannot find the other one-someone else will jump in and find it for you:

kelsfine69 · 11-01-2005, 12:39 AM

I have the th400. Took the electric kick down out when i swapped motors to clean up the carb area. Didn't notice much change except when passing, it wont kick down ,you have to do it manually

demi · 11-01-2005, 03:10 AM

Quote:

Originally Posted by jhow66

Here is one for the cable ones-cannot find the other one-someone else will jump in and find it for you:

Here's a carb mounted one.

76bonanza · 11-01-2005, 02:35 PM

I wonder if I can use any wideopen throtle switch? Or a switch in the cab to make it downshift just joking about that. But I have a switch for an old NOS setup wonder if it would work.

*FormerMember* · 11-01-2005, 02:43 PM

Lokar makes a great kick down switch that's carb actuated.

You could also use a momentary or a push button switch to send voltage.

11-01-2005, 12:08 AM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Th400 question I have a th400 in my truck this is the first one I have owned all the rest had th350. Anyway on to the question on the front driver side is a plug or sender with a male electric spade. Nothing is connected to it. What is it? seems to run fine with nothing hooked up to it? Thanks __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

11-01-2005, 12:19 AM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Th400 question This is the electric kickdown for passing gear. A wire runs from this to a switch on the gas pedal bracket (on ones with cable operated gas feed) and then from the switch to a hot only with switch on to the fuse panel. On trucks that have a rod operated gas feed the switch is on the carb. Will try to find you pictures of the switchs. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

11-01-2005, 12:31 AM	#3
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Th400 question Here is one for the cable ones-cannot find the other one-someone else will jump in and find it for you: Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

11-01-2005, 12:39 AM	#4
kelsfine69 18 Till I Die Join Date: Mar 2005 Location: Alberta, Canada Posts: 1,522	Re: Th400 question I have the th400. Took the electric kick down out when i swapped motors to clean up the carb area. Didn't notice much change except when passing, it wont kick down ,you have to do it manually __________________ 2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...

11-01-2005, 02:35 PM	#6
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: Th400 question I wonder if I can use any wideopen throtle switch? Or a switch in the cab to make it downshift just joking about that. But I have a switch for an old NOS setup wonder if it would work. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

11-01-2005, 02:43 PM	#7
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: Th400 question Lokar makes a great kick down switch that's carb actuated. You could also use a momentary or a push button switch to send voltage.



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