Big Block/TH400 Guys, I Need A Pic Please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 11-16-2006, 12:32 AM

Tryin to get all the parts together to turn my 70 3/4 ton 350 back to an oringinal 402 big block, wondering if i could get a pic of the throttle linkage, and any kind of kickdown linkages and stuff. I was looking in the service manual and saw several different linkage combos and an electric kickdown switch, mine seems to have none of these. I want to turn this truck back to stock, since the only thing ever done to it was a 350 swap by the PO due to a blown motor. So any pics of factory style big block resto's would be great, thanks, Ryan

Blue85 · 11-16-2006, 11:49 AM

Must been some factory guys on here

Texasdeere · 11-16-2006, 01:06 PM

This is a pic off an ebay ad that might help. I don't think the bigblocks used any kickdown linkage but some kind of solenoid switch instead.

Blue85 · 11-16-2006, 02:30 PM

thanks man!

Texasdeere · 11-16-2006, 03:35 PM

I went and looked at my 72 truck and it looked the same. That big solenoid looks like an a/c idle up.

396C20 · 11-16-2006, 04:08 PM

Is this what you're looking for? It's on my 69 and I don't know if it's the same as a 70.

JimKshortstep4x4 · 11-16-2006, 08:39 PM

Here is a pic of the kickdown switch as mounted on a Q-Jet carb.

Jim

mr402 · 11-17-2006, 12:45 AM

My 71 looked almost exactly like the one in the pic from Texas C10. The solenoid has nothing to do with AC as mine was not an AC truck. There is no kick down switch for the TH400 on a 71 or 72. Can’t say about the 70 though.

Texasdeere · 11-17-2006, 09:30 AM

It is weird my 78 has nothing on the carb at all. My 72 looks like the first picture. Both trucks have TH400s and AC. I have no idea how the TH400 kickdown works.

JimKshortstep4x4 · 11-17-2006, 09:40 AM

Here is a picture of the kickdown switch for the TH 400 as used on the 71-72 trucks. It is mounted inside the cab above the accelerator pedal.

Jim

prostreet1967 · 11-17-2006, 09:41 AM

Quote:

Originally Posted by JimKshortstep4x4

Here is a pic of the kickdown switch as mounted on a Q-Jet carb.

Jim

the turbo400 uses a electric kickdown the thing bolted to the base of carb is activated at wot and sends 12v to the spade connector on drivers side of trans u can do away with that big swich and use a mini microswitch like the ones used on a nitrous system 12v coming in to swithc and 12v coming out a wot

Texasdeere · 11-17-2006, 10:47 AM

Thanks Jim! I will check my trucks for that type of switch.

Texasdeere · 11-18-2006, 12:54 PM

Both my 78 and 72 C10 have that same kickdown switch.

Thanks for the info and sorry to have highjacked!

11-16-2006, 12:32 AM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Big Block/TH400 Guys, I Need A Pic Please Tryin to get all the parts together to turn my 70 3/4 ton 350 back to an oringinal 402 big block, wondering if i could get a pic of the throttle linkage, and any kind of kickdown linkages and stuff. I was looking in the service manual and saw several different linkage combos and an electric kickdown switch, mine seems to have none of these. I want to turn this truck back to stock, since the only thing ever done to it was a 350 swap by the PO due to a blown motor. So any pics of factory style big block resto's would be great, thanks, Ryan __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

11-16-2006, 11:49 AM	#2
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Big Block/TH400 Guys, I Need A Pic Please Must been some factory guys on here __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

11-16-2006, 01:06 PM	#3
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Big Block/TH400 Guys, I Need A Pic Please This is a pic off an ebay ad that might help. I don't think the bigblocks used any kickdown linkage but some kind of solenoid switch instead. Attached Images Last edited by Texasdeere; 11-16-2006 at 01:09 PM.

11-16-2006, 02:30 PM	#4
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Big Block/TH400 Guys, I Need A Pic Please thanks man! __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

11-16-2006, 03:35 PM	#5
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Big Block/TH400 Guys, I Need A Pic Please I went and looked at my 72 truck and it looked the same. That big solenoid looks like an a/c idle up. Last edited by Texasdeere; 11-16-2006 at 03:43 PM.

11-16-2006, 04:08 PM	#6
396C20 Registered User Join Date: Apr 2006 Location: SoCal Posts: 70	Re: Big Block/TH400 Guys, I Need A Pic Please Is this what you're looking for? It's on my 69 and I don't know if it's the same as a 70. __________________ 69 Chev C20 396 T400 Dana 60 3.54 A/C Daily Driver - Stolen 67 Chevy C20 CST

11-16-2006, 08:39 PM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Big Block/TH400 Guys, I Need A Pic Please Here is a pic of the kickdown switch as mounted on a Q-Jet carb. Jim Attached Images

11-17-2006, 12:45 AM	#8
mr402 Registered User Join Date: Jan 2004 Location: Elmira, Oregon Posts: 449	Re: Big Block/TH400 Guys, I Need A Pic Please My 71 looked almost exactly like the one in the pic from Texas C10. The solenoid has nothing to do with AC as mine was not an AC truck. There is no kick down switch for the TH400 on a 71 or 72. Can’t say about the 70 though. __________________ Enjoying life again. Time to get those big blocks rolling.

11-17-2006, 09:30 AM	#9
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Big Block/TH400 Guys, I Need A Pic Please It is weird my 78 has nothing on the carb at all. My 72 looks like the first picture. Both trucks have TH400s and AC. I have no idea how the TH400 kickdown works.

11-17-2006, 09:40 AM	#10
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Big Block/TH400 Guys, I Need A Pic Please Here is a picture of the kickdown switch for the TH 400 as used on the 71-72 trucks. It is mounted inside the cab above the accelerator pedal. Jim Attached Images

11-17-2006, 10:47 AM	#12
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Big Block/TH400 Guys, I Need A Pic Please Thanks Jim! I will check my trucks for that type of switch.

11-18-2006, 12:54 PM	#13
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Big Block/TH400 Guys, I Need A Pic Please Both my 78 and 72 C10 have that same kickdown switch. Thanks for the info and sorry to have highjacked!



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