Hand throttle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BobS · 12-03-2004, 12:15 PM

Does anyone know how and where the cable for a 67-70 hand throttle is mounted as it passes through the firewall?

Bob

67ChevyC10Stepside · 12-03-2004, 12:25 PM

what is this hand throttle stuff all about? i saw a bezel with it but dont understand.

**CPNE** · 12-03-2004, 12:29 PM

Quote:

Originally Posted by BobS

Does anyone know how and where the cable for a 67-70 hand throttle is mounted as it passes through the firewall?

Bob

Sorry no pic, but it attached to a bracket that is clamped onto the pedal rod on the engine side of the firewall.

**CPNE** · 12-03-2004, 12:33 PM

Quote:

Originally Posted by 67ChevyC10Stepside

what is this hand throttle stuff all about? i saw a bezel with it but dont understand.

It is a way of setting and maintaining a higher engine rpm without having to put your foot on the pedal. The cable/knob mechanism as detents in it to allow for several setting that can be fine-tuned to some degree.

Why, you ask? To operate PTO's and/or engine driven hydraulics without having to be in the cab or in instances where you can't conveniently do it via the foot pedal. Think of applications like plows, winches, dump bodies, etc. It is not a poor man's cruise control

BobS · 12-03-2004, 12:36 PM

I've got the piece that bolts to the rod on the engine side, it seems like there should be some kind of clamp that secures the cable to the firewall to eliminate slop?

Hand throttles were an option, although mostly used on the larger trucks, to increase idle speeds or operate a PTO.

Bob

67ChevyC10Stepside · 12-03-2004, 12:42 PM

oh.....i didnt know if it was for when your foot got tired or what lol.

**Yukon Jack** · 12-03-2004, 03:45 PM

Like stated above, the hand throttle is commonly used to keep rpm's up while using a PTO accessory.

Here are two pics showing how it is attached to the throttle arm.

Oakley · 12-03-2004, 05:02 PM

I have a 71 blazer 4X4 with the throttle option but mine does not go thru the firewall mine attaches to the gas pedal itself.

dubie · 12-03-2004, 05:06 PM

Mine didn't even go thru the firewall. It attached right ot a bracket on the pedal. You would pull it out a couple clicks and it would pull the pedal down to where you wanted it. I took it off and sold it to a former board member to run higher rpm's for his A/C in the desert. Sure wish I wouldn't have sold it now tho

It was a great Redneck cruise control :F

**CPNE** · 12-03-2004, 06:18 PM

Quote:

Originally Posted by Oakley

I have a 71 blazer 4X4 with the throttle option but mine does not go thru the firewall mine attaches to the gas pedal itself.

Taht is the 71/72 version. Change in design due to change in accellerator linkage from rod to cable.

BobS · 12-03-2004, 08:56 PM

Yukon Jack,

Do you have a pic or even a description of the other side of the firewall where the cable goes through? Does it just come through the firewall or is there some kind of clamp or grommet or something else?

Bob

**chevy71super** · 12-03-2004, 09:03 PM

My dad's 72 had one. Ranch truck, we used it feeding cattle. Put the truck in 4 wheel low, 1st gear, and pulled the knob out a few clicks. Jumped in back and started throwing hay to the cows. With over a ton of hay in the back that thing would idle right along through almost anything. Snow or no snow. (Ground was usually frozen solid.) When it got real bad we would chain it up. The good old days . . .

Bob Moore · 12-03-2004, 09:24 PM

Location through the firewall.

If you look close from the engine side you will see a dimple or nipple ( i can't remember which on the engine side) - that is the location to drill a very small hole to feed the cable through. The factory had a spring cable clamp to secure the outer housing. The location of the dimple is roughly at the top of throttle arm and slightly centered from the throttle arm. Another way to find the location from the interior is to look for a knock-out in the firewall padding (approximately 3/4inch) - the dimple is behind it. Remove the knock-out and you should see the dimple.

Hope this helps - Bob

teamharvey · 12-03-2004, 09:32 PM

So that is what this bracket is/was for ? I would like to get rid of mine since it is useless except that it holds my throttle assembly in place. Is there another bracket I could use /

thanks,
bret

Bob Moore · 12-03-2004, 09:40 PM

That is a 71-72 throttle bracket - the cable style. The T-400 kick-down switch mounted there and was activated when the arm came back as the trottle was stepped on. The hand throttle for 71 & 72 also mounted to the bracket on the upper corner - I believe.

Solver · 12-03-2004, 10:49 PM

My green 67 came factory with a hand throttle but I have never checked underneath to see how it is hooked up.

**Yukon Jack** · 12-03-2004, 11:38 PM

BobS, like Bob Moore stated, there is a metal clamp that goes through the hole in the firewall to secure the cable. No grommet at least on mine.

BobS · 12-04-2004, 01:16 AM

Looks like all I'm missing is a clamp then, anyone know where to find one?

Bob

12-03-2004, 12:15 PM	#1
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	Hand throttle Does anyone know how and where the cable for a 67-70 hand throttle is mounted as it passes through the firewall? Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

12-03-2004, 12:25 PM	#2
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	what is this hand throttle stuff all about? i saw a bezel with it but dont understand. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

12-03-2004, 12:36 PM	#5
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	I've got the piece that bolts to the rod on the engine side, it seems like there should be some kind of clamp that secures the cable to the firewall to eliminate slop? Hand throttles were an option, although mostly used on the larger trucks, to increase idle speeds or operate a PTO. Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

12-03-2004, 12:42 PM	#6
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	oh.....i didnt know if it was for when your foot got tired or what lol. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

12-03-2004, 03:45 PM	#7
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Like stated above, the hand throttle is commonly used to keep rpm's up while using a PTO accessory. Here are two pics showing how it is attached to the throttle arm. Attached Images __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 Last edited by Yukon Jack; 12-03-2004 at 03:48 PM.

12-03-2004, 05:02 PM	#8
Oakley Junior Member Join Date: Jul 2003 Location: Wisconsin Rapids WI Posts: 36	I have a 71 blazer 4X4 with the throttle option but mine does not go thru the firewall mine attaches to the gas pedal itself. Last edited by Oakley; 12-03-2004 at 05:09 PM.

12-03-2004, 05:06 PM	#9
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	Mine didn't even go thru the firewall. It attached right ot a bracket on the pedal. You would pull it out a couple clicks and it would pull the pedal down to where you wanted it. I took it off and sold it to a former board member to run higher rpm's for his A/C in the desert. Sure wish I wouldn't have sold it now tho It was a great Redneck cruise control :F __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

12-03-2004, 08:56 PM	#11
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	Yukon Jack, Do you have a pic or even a description of the other side of the firewall where the cable goes through? Does it just come through the firewall or is there some kind of clamp or grommet or something else? Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

12-03-2004, 09:03 PM	#12
chevy71super Registered User Join Date: Jan 2002 Location: So Cal Posts: 658	My dad's 72 had one. Ranch truck, we used it feeding cattle. Put the truck in 4 wheel low, 1st gear, and pulled the knob out a few clicks. Jumped in back and started throwing hay to the cows. With over a ton of hay in the back that thing would idle right along through almost anything. Snow or no snow. (Ground was usually frozen solid.) When it got real bad we would chain it up. The good old days . . .

12-03-2004, 09:24 PM	#13
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Hand Throttle Location through the firewall. If you look close from the engine side you will see a dimple or nipple ( i can't remember which on the engine side) - that is the location to drill a very small hole to feed the cable through. The factory had a spring cable clamp to secure the outer housing. The location of the dimple is roughly at the top of throttle arm and slightly centered from the throttle arm. Another way to find the location from the interior is to look for a knock-out in the firewall padding (approximately 3/4inch) - the dimple is behind it. Remove the knock-out and you should see the dimple. Hope this helps - Bob __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

12-03-2004, 09:32 PM	#14
teamharvey Registered User Join Date: Jul 2004 Location: Turlock, Ca Posts: 578	So that is what this bracket is/was for ? I would like to get rid of mine since it is useless except that it holds my throttle assembly in place. Is there another bracket I could use / thanks, bret Attached Images __________________ 71 Custom 20 Deluxe..soon to be SWB 1/2 ton 1 incredible wife 2 great kids Last edited by teamharvey; 12-04-2004 at 12:31 AM.

12-03-2004, 09:40 PM	#15
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	what is bracket That is a 71-72 throttle bracket - the cable style. The T-400 kick-down switch mounted there and was activated when the arm came back as the trottle was stepped on. The hand throttle for 71 & 72 also mounted to the bracket on the upper corner - I believe. __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

12-03-2004, 10:49 PM	#16
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	My green 67 came factory with a hand throttle but I have never checked underneath to see how it is hooked up. Attached Images __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

12-03-2004, 11:38 PM	#17
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	BobS, like Bob Moore stated, there is a metal clamp that goes through the hole in the firewall to secure the cable. No grommet at least on mine. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-04-2004, 01:16 AM	#18
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	Looks like all I'm missing is a clamp then, anyone know where to find one? Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel



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