Join Date: Oct 2014
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A mount that is rotting away is obviously bad, but a mount that isn't rotting away isn't necessarily good.
I used to work for a Tier 1 automotive OEM mount supplier. Conventional mounts have about a 10 year life span. That can be even less with extended idling. After that length of time/usage - in many cases - a hunk of 2x4 might get you as much isolation.
That wasn't some manufacturers recommended change-out. Nobody gives a crap about mounts and they are rarely, if ever, changed. They was just the pragmatic view of their lifetime.
That said... aging mounts typically don't get more compliant. They get less. So, in this case, I might look elsewhere. But - to the question of whether the mounts are "good" or not - probably not. ...they just aren't causing the problem described.
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLink™ LX, Autometer EGT