Camp
I have a 67 GMC tilt cab and have had that problem also. It works after some back woods Cobboligy was used and some homemade parts.
Get your links to work and I get some pictures of what I did after this weekend.
The best cure would be to rig up a cable linkage that doesn’t have the sliding rod system.
Read the story of this truck in my sig.

Don


1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!