1966 GMC L4000 Tilt Cab throttle linkage help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Campbel45 · 11-05-2020, 06:32 PM

Hey guys,

I dragged home another toy. Its a 1966 GMC tilt cab with a 305 V6. Shes in overall pretty good shape. Runs but I'm pretty sure has blown head gaskets or something worse. Smokes white pretty bad.

Anyway, my problem at hand is the throttle linkage. When I press on the pedal, nothing happens. I think the pedal rod is compressing into itself - see the video and pictures below

Does anyone have a tilt cab they can take some pictures or better yet a video? Its been kinda of difficult to find any information on these.

Thanks for the help.

Video =>

2and4wheels · 11-06-2020, 10:10 AM

I have a 1968 GMC tilt cab with a 351 V6, I can take a picture of the linkage when I get home from work

**CarolinaHD** · 11-06-2020, 04:21 PM

Subscribing to check my parts manual later

2and4wheels · 11-06-2020, 05:06 PM

Hopefully this link works. If not I will post them individually.

https://photos.app.goo.gl/Jjthv3TUEaNTjyzT8

Campbel45 · 11-07-2020, 01:08 AM

Thanks guys!

2and4wheels, do you have any issues with your throttle?

I did notice that I have my throttle linkage attached to the carb differently than yours. In my head, this wouldn’t matter right now because my throttle linkage is either compressing or extending and not pushing\pulling on the carb.

The guys over on the stovebolt forum recommended me to put a hose clamp on the collapsible throttle section as a stop.

I need to get out there and study it some more.

**Bob B.** · 11-07-2020, 03:13 AM

I think you got the throttle rod in the wrong hole on the carburetor throttle lever. Shouldn't it be in the hole below the throttle shaft? If the rod pulls towards the front as you press down on the pedal, it needs to be in the bottom hole on the throttle lever

2and4wheels · 11-07-2020, 09:08 AM

I haven't had the truck for long. It's been sitting for a couple of years, and has a clutch issue (line has a rust hole).
But the linkage is free and does not bind through idle to WOT.

Campbel45 · 11-10-2020, 03:12 PM

Well I feel silly, but I have a working throttle now!

Once I switched to the lower position on the carb, gas pedal worked.

I still don't full understand the collapsible throttle rod part.. perhaps it has a spring on the inside of it?

Thanks for the help guys!

11-05-2020, 06:32 PM	#1
Campbel45 Registered User Join Date: May 2013 Location: Greenwood, IN Posts: 379	1966 GMC L4000 Tilt Cab throttle linkage help Hey guys, I dragged home another toy. Its a 1966 GMC tilt cab with a 305 V6. Shes in overall pretty good shape. Runs but I'm pretty sure has blown head gaskets or something worse. Smokes white pretty bad. Anyway, my problem at hand is the throttle linkage. When I press on the pedal, nothing happens. I think the pedal rod is compressing into itself - see the video and pictures below Does anyone have a tilt cab they can take some pictures or better yet a video? Its been kinda of difficult to find any information on these. Thanks for the help. Video => Last edited by Campbel45; 11-05-2020 at 08:18 PM.

11-06-2020, 10:10 AM	#2
2and4wheels Registered User Join Date: Oct 2019 Location: Danville Posts: 4	Re: 1966 GMC L4000 Tilt Cab throttle linkage help I have a 1968 GMC tilt cab with a 351 V6, I can take a picture of the linkage when I get home from work

11-06-2020, 04:21 PM	#3
CarolinaHD Moderator Join Date: Aug 2017 Location: Cabarrus Posts: 418	Re: 1966 GMC L4000 Tilt Cab throttle linkage help Subscribing to check my parts manual later __________________ Alex 1967 C50 292ci Lumber truck 1967 C50 292ci Dump truck 1967 C60 366ci Fire truck

11-06-2020, 05:06 PM	#4
2and4wheels Registered User Join Date: Oct 2019 Location: Danville Posts: 4	Re: 1966 GMC L4000 Tilt Cab throttle linkage help Hopefully this link works. If not I will post them individually. https://photos.app.goo.gl/Jjthv3TUEaNTjyzT8

11-07-2020, 01:08 AM	#5
Campbel45 Registered User Join Date: May 2013 Location: Greenwood, IN Posts: 379	Re: 1966 GMC L4000 Tilt Cab throttle linkage help Thanks guys! 2and4wheels, do you have any issues with your throttle? I did notice that I have my throttle linkage attached to the carb differently than yours. In my head, this wouldn’t matter right now because my throttle linkage is either compressing or extending and not pushing\pulling on the carb. The guys over on the stovebolt forum recommended me to put a hose clamp on the collapsible throttle section as a stop. I need to get out there and study it some more.

11-07-2020, 03:13 AM	#6
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,363	Re: 1966 GMC L4000 Tilt Cab throttle linkage help I think you got the throttle rod in the wrong hole on the carburetor throttle lever. Shouldn't it be in the hole below the throttle shaft? If the rod pulls towards the front as you press down on the pedal, it needs to be in the bottom hole on the throttle lever __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

11-07-2020, 09:08 AM	#7
2and4wheels Registered User Join Date: Oct 2019 Location: Danville Posts: 4	Re: 1966 GMC L4000 Tilt Cab throttle linkage help I haven't had the truck for long. It's been sitting for a couple of years, and has a clutch issue (line has a rust hole). But the linkage is free and does not bind through idle to WOT.

11-10-2020, 03:12 PM	#8
Campbel45 Registered User Join Date: May 2013 Location: Greenwood, IN Posts: 379	Re: 1966 GMC L4000 Tilt Cab throttle linkage help Well I feel silly, but I have a working throttle now! Once I switched to the lower position on the carb, gas pedal worked. I still don't full understand the collapsible throttle rod part.. perhaps it has a spring on the inside of it? Thanks for the help guys!



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