Switch on gas petal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

boogie67 · 03-19-2005, 09:07 PM

My sons 72 has aswitch on the gas petal .When you press the gas all the way it engages the switch.What is this for? It has a turbo 400 in it.

71-longbed · 03-19-2005, 09:17 PM

kickdown for the tranny i think

boogie67 · 03-19-2005, 09:24 PM

Thats what I thought but I have never owed a 400 trans before.The plug on the side of the trans has A two prog plug on it but only one wire goes down from the switch.Is there some missing?The other wire goes to the fuse box I think.

70short · 03-19-2005, 11:29 PM

Can you take some pictures of that and post them?? I put A TH400 in my truck and I really need to get A kickdown switch. I would like to see how it is installed.. THANK YOU

Gary

boogie67 · 03-19-2005, 11:34 PM

Im sorry but I have no wayto put picture up.Maybe somebody else here has pictures.

COBRO · 03-20-2005, 12:37 AM

The two prongs on the plug in the trans. was used in the early 70s th400s that had a spark controller in the trans.valve body that would retard the timming when you kicked it into second gear to prevent knock - think it was part of early smog equipment in cars. If your valve body does not have the spark controller then just one of the prongs is used and connects to the kick down solenoid - have had rebuilt 400s that had the two prong plugs but only used one of them. On the switch on the pedal your right - a hot feed on one side and then the controlling wire to the trans. The peddle switch is still availble from GM as I got a new one not to long ago for my trk when I changed it over to a automatic. This switch was done two different ways depending on the model - one like you have described and the other was on the carb. Had a 68 396 Camaro with the switch on the carb. HTH:::CB

boogie67 · 03-20-2005, 12:47 AM

Hope this dose not sound dumb but dose it matter which prong I use on the trans.When I went to get a filter for this trans they said it was a 66 model as it had this weird looking filter in it.It was all metal I guess the filter was inside of this.

Bob Moore · 03-20-2005, 12:52 AM

The 71/72 T400 kickdown used a pink wire from the fuse block(hot in run) and the wire from the switch to the tranny was orange. I do not know the wire color of the second wire at the tranny that COBRO posted. Not saying he's wrong but I just don't know that color.

jhow66 · 03-20-2005, 01:22 AM

Quote:

Originally Posted by boogie67

Hope this dose not sound dumb but dose it matter which prong I use on the trans.When I went to get a filter for this trans they said it was a 66 model as it had this weird looking filter in it.It was all metal I guess the filter was inside of this.

Yes--to check which one to use have someone depress the switch (switch on) and touch the wire at trans to each prong--when you hear a "click" that is the right one.

COBRO · 03-20-2005, 01:29 AM

You can use either prong for the connection but just be sure of which prong the solenoid is hooked to on the inside of the pan - if your getting ready to change the filter then you will see what Im talking about when you drop the pan. It doesnt matter when the trans was built as a rebuilder will stick in

whatever is on hand when he puts it back together - that 66 trans is most likely just the case anyway as rebuilders dont keep parts together unless you have them rebuild your trans and not just stick another one in to get you back on the road. I dont know what the factory wire colors were - as I said I replaced the manual 4sp with a 400 and did the wiring and added the kickdown switch myself. And you said the parts guy sold you the old style filter - that may be whats in your trans and maybe not so match the filter to whats in there now,rebuilt transmissions can be a real mix of parts so you cant really go by the code on the case unless you know for sure what you have::::::::CB

03-19-2005, 09:07 PM	#1
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	Switch on gas petal My sons 72 has aswitch on the gas petal .When you press the gas all the way it engages the switch.What is this for? It has a turbo 400 in it.

03-19-2005, 09:17 PM	#2
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	kickdown for the tranny i think __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

03-19-2005, 09:24 PM	#3
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	72switch Thats what I thought but I have never owed a 400 trans before.The plug on the side of the trans has A two prog plug on it but only one wire goes down from the switch.Is there some missing?The other wire goes to the fuse box I think.

03-19-2005, 11:29 PM	#4
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	Can you take some pictures of that and post them?? I put A TH400 in my truck and I really need to get A kickdown switch. I would like to see how it is installed.. THANK YOU Gary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

03-19-2005, 11:34 PM	#5
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	400switch Im sorry but I have no wayto put picture up.Maybe somebody else here has pictures.

03-20-2005, 12:37 AM	#6
COBRO Active Member Join Date: Jan 2005 Location: RDM,Oregon Posts: 285	The two prongs on the plug in the trans. was used in the early 70s th400s that had a spark controller in the trans.valve body that would retard the timming when you kicked it into second gear to prevent knock - think it was part of early smog equipment in cars. If your valve body does not have the spark controller then just one of the prongs is used and connects to the kick down solenoid - have had rebuilt 400s that had the two prong plugs but only used one of them. On the switch on the pedal your right - a hot feed on one side and then the controlling wire to the trans. The peddle switch is still availble from GM as I got a new one not to long ago for my trk when I changed it over to a automatic. This switch was done two different ways depending on the model - one like you have described and the other was on the carb. Had a 68 396 Camaro with the switch on the carb. HTH:::CB

03-20-2005, 12:47 AM	#7
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	switch Hope this dose not sound dumb but dose it matter which prong I use on the trans.When I went to get a filter for this trans they said it was a 66 model as it had this weird looking filter in it.It was all metal I guess the filter was inside of this.

03-20-2005, 12:52 AM	#8
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	The 71/72 T400 kickdown used a pink wire from the fuse block(hot in run) and the wire from the switch to the tranny was orange. I do not know the wire color of the second wire at the tranny that COBRO posted. Not saying he's wrong but I just don't know that color. __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

03-20-2005, 01:29 AM	#10
COBRO Active Member Join Date: Jan 2005 Location: RDM,Oregon Posts: 285	You can use either prong for the connection but just be sure of which prong the solenoid is hooked to on the inside of the pan - if your getting ready to change the filter then you will see what Im talking about when you drop the pan. It doesnt matter when the trans was built as a rebuilder will stick in whatever is on hand when he puts it back together - that 66 trans is most likely just the case anyway as rebuilders dont keep parts together unless you have them rebuild your trans and not just stick another one in to get you back on the road. I dont know what the factory wire colors were - as I said I replaced the manual 4sp with a 400 and did the wiring and added the kickdown switch myself. And you said the parts guy sold you the old style filter - that may be whats in your trans and maybe not so match the filter to whats in there now,rebuilt transmissions can be a real mix of parts so you cant really go by the code on the case unless you know for sure what you have::::::::CB



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