I have a 1.5 ton bottle jack that works.It has the screw out part in the cylinder shaft that extends about 5".
Also, have you tried the factory screw jack from a 73/87 Chevy truck?
I have used the bottle jack on my 68,but not the screw jack.
Stupid truck had the original tires on it when I bought it and one had the audacity to go flat on me!Seems nothing lasts very long anymore!
Mike.
