thatcabledude
GOLD Star
Great description. I’m guessing mine is just wore out bearings (370k mi) as I’m part time and it was converted by welding the center diff.80s with tall lifts and uncorrected front caster make for some angry front DSs. This is well-documented in the 80 section - as are the solutions.
HF2As have a little output shaft wobble at slack throttle due to no torque going through the center diff. This increases with age as the spiders wear in, as the center diff output gears are what locates the "free end" of the output shafts. Putting some torque in it causes everything to tighten-up and center-up. Part time trucks see this to a lesser degree as the worn spiders get replaced with fresh, solid parts that tighten everything up.
Time to go part-time @Broski!