I got this email today:
I have a problem. I am restoring a 1940 ¾ ton GMC panel truck. I removed the caked grease and rear springs to clean and refinish. The springs are held on by a collet wrapped around the axle tube with u-bolts. Actually this collet is somewhat loose and is held in place on the axle tube by a half-moon key that is, I believe, riveted to the axle tube. My problem is that the rear end grease will drain out and around the rivets. This happened when the axle dropped down and became unlevel. I can't help from feeling this is wrong and refuse to continue this project until I find someone who knows my situation. I certainly hope you have the time and knowledge to help.

I have no clue what this fella is referring to. Anyone know?

My info indicates that an AC150 panel (yes GMC offered a 3/4 ton panel in '40) used a torque tube. The spring perches appear to be mounted in the same fashion as later year torque tubes in other trucks; part of the rear axel and not really removeable/serviceable.

Anyone had one of these apart that knows what this guy is trying to figure out? I'm lost.

http://www.oldgmctrucks.com