Your second picture looks like your measurement is to the cab support BELOW the floor proper. Measure to the bottom of the floor itself, although that will only get you 1/16" more without adding shims.

On the rear, is it possible that the cab shackles are too long? Are they originals? Here's a picture of mine wen removed, although I can't measure them right now, yours look a little skinnier, but maybe that's just the way the picture makes them look.
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Last edited by klhansen; 02/02/2026 2:28 AM.

Kevin
1951 Chevy 3100 work truck
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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.