Changed the oil, lubed the spring shackles, and noticed the nuts on the rear lower shock mounts were rubbing the inner sidewalls of the rear tires (a new issue since lowering the truck). I replaced the nuts with ones not quite so long/tall, and shortened the studs a little, which gained quite a bit of clearance (3/8" - 1/2"?). Good to go now.

Eric
1950 Chevy 3100
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Stovebolt Reading