The question is what is your actual caster angle right now, forget what the shims are, what is the amount the king pins lean forward from vertical?

If you know what you have, and what the max allowable is, you can decide what you want yours to be. Then take that and the knowledge you have about your old shims, and order the correct new ones.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-