did the 3/4 Ton have smaller wheels like the 1/2 Ton?
my 3/4 ton has the same rear axle as the 1 tons, but it's a Canadian version, and it may have been modified years ago, so i don't know for certain anymore if the 3/4 ton absolutely needs the taller jack.
reading the GM specs, the 1/2 and 3/4 tons should use the same jack that extends 15.25 inches
the 1 ton jack extends to 16 inches
perhaps i have a 1.5+ Ton jack, those go to 18.125 inches and i'm pretty sure that jack i found would go that high
i'm not confident my cast jack is the correct one for the 1 ton, but it works and it the best i have
i know the 1/2 ton jack is too short, i tried it, put it back in the shed.
on my 1 ton, the rim is 17 inches, with 750-17, so taking half of the tire diameter which is listed at about 34 inches for the tire means it's 17 inches from the ground to the center of the axle, so take off another 1.5 inches for the axle radius leaves a gap of 15.5 inches or so to reach the axle. that 16 inch spec for the 1 ton jack is not very generous then
if you are on soft ground, you must put a plank under it, or that wheel is not coming off the ground then.
-stan
