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If in doubt, change them out. Best case scenario is to find good replacements from a donor truck. Worst case, take the existing arms to a machine shop, have the welds ground off, remove the worn pins, have new pins machined with a 3/4"-10 thread on the ends, weld the pins into the arms and reinstall the arms on the truck.
If in doubt, change them out. Best case scenario is to find good replacements from a donor truck. Worst case, take the existing arms to a machine shop, have the welds ground off, remove the worn pins, have new pins machined with a 3/4"-10 thread on the ends, weld the pins into the arms and reinstall the arms on the truck.