Over the years there are few things about truck hydraulics that have escaped me. Been in the business since 1967. On occasion I've built hoists like you describe from scratch so yes, I've made the hinges. However in my experience it is better to purchase a factory built hinge [censored]'y. If you do make it forget about the solid shaft idea and use a 4"x4" angle to recess into the frame horns. Then hinge from it on each side with a short hinge pin to attach to either a plate style hinge on the outside of the frame or a double shear style that the longsill sits on.

If you use twin cylinders they need to be 3"-4" telescopics and about 60" stroke, i.e., 3260 or 4-2-60 model. This assumes an 84" cab to axle dimension and a 10' body length. Set the cylinders to get a minimum of 45 degrees dump angle. The pump needs only a 1200-1500 psi setting for twins. Make certain that your pump has the correct rotation for the PTO you have. Many newer pumps are bi-rotational but most older ones are not. Probably the best bet is the electric pump/valve [censored]'y. You'll need a larger reservoir with the twin telescopic cylinders and most electrics have fairly small tanks. Stability is the main issue with these small twins as well as leaks on the inexpensive farm cylinders so many use. I much prefer underbody twin arms or scissor design for these reasons.

I will attempt to e-mail you the parts list/owners manual on what I currenly use. You will find it of interest as well as a possible source of parts. Any questions you have or additional information you need I will try to help you with.

1953 Chevy 5-window 3100
In the Stovebolt Gallery
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Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain