Thanks George for the reminder!
The 48 3/4 ton Chalkboard has that on the gear shift.
It's forked and you can't get it into reverse, unless you pull up and shift it over to the right and then back.

Started to steal this thread, but deleted the question.
The Grand Pooh Bear may be able to chime in here and answer your question.

Don't be a stranger, jump into the garage chatter all you want!
Don

Edit: Still waiting on pictures!

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!