This is all great information and is giving me a lot to check on my truck. I did measure the camber today and it's 2 degrees positive on the drivers side and 1 degree positive on the passenger side. I will need to measure the caster shims to see it's present angle. At this point I have to no reason to think they aren't the original shims but I will measure. I will need to pull a wheel off and determine the rim width and offset. I did have to put 1/4" wheel spacers to clear the tie rod ends when I changed the rims. I can't find my receipts for the rims so I will have to measure it out.

Jon G I understand what you are saying about the drag link. Question is if it's not fairly parallel to the ground how can one fix that? The truck does sit level and I replaced the front springs with the correct set meant for this truck with the same number of leaves as the old ones.

What I'm thinking is I've screwed up the steering geometry in my efforts to modernize the rims and tires. I'm not opposed to replacing rims/tires to a more appropriate sizing.

Can you all help me understand the old tire size designations. According to the shop manual stock would have been 15-6 or 7.00-17-6 How do those number translate into a modern tire size designation? 15-6 = 15" rim x 6" width?

1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado