Don - your king pin specs are found in the GM Heritage Center 1946 Chevrolet Truck Data PDF.

Screenshot below highlights the details:

King Pin Diameter = .9210" - .9214"

King Pin Bushings Inner Diameter = .922" - .923"

King Pin Bushings Length = 1 - 17/64"

PS - I moved this to the Driveline forum where it fits best. wink
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)