This is the Fluidampr harmonic ballancer for the 6.2 and 6.5 diesel engines. It fits both the DS4 (electronic) and DB2 (Manual) injection pump equipped engines.
The 6.5 crankshafts are known to be a weak point and if the original balancer stops working properly the chance you will break the crankshaft goes up tremendously.
Check your original harmonic balancer every oil change for bulging/cracked rubber.
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