Generally, Al and CI use NC threads, steel uses NF threads, so, if there is doubt, start there.
Ed
The only fine threads I know of on an AD truck are the door hinge bolts, the parking brake cable clevises, and maybe the adjuster for the clutch pedal.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
