Aside from plain worn parts, the all-new front job may be manifesting a common frame stamping error: Check Post #20 for the TSB#:
You might also search 'rear control arm mounting hole' for this issue if your problem is not just maint. parts replacement related.
Variable readings could also be a wallered/hogged out frame hole, though that's usually associated with a clunk on hard accelerating or braking. I had that on a Monte and a FWB.
For recommendations? As Fred says not much actually "required" if not doing stab bar upgrade. Any B/D body deserves one though, which also call for aftermarket rear LCAs. When replacing the rear UCA bushings on the axle ears never use urethane - creates torsion bind.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
Last edited by 96 Black; 08-05-2017 at 07:24 AM.