Counter weight / harmonic dampener?
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Lead Driver
Joined: Apr 2008
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Counter weight / harmonic dampener?
So ive had an odd "driveline" vibration since putting in an aod in place of c4, and 8.8 in place of the 8". The C4 had a long weight hung off the tailshaft, and the 8.8 had a large round weight bolted to the snout. Currently, there are no weights. Do these serve a meaningful purpose? Theres no way to attatch it to the AOD, and i took it off the 8.8 to save weight, and also because im not sure it will clear.
Lead Driver
Joined: Sep 2003
Posts: 7,015
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From: SoCal
Those hanging weights are dampeners, like the rotational harmonic dampener on the front of your engine. They consist of a weight attached through a rubber layer to the bracket that bolts to the tail housing, intended to dampen certain harmonic vibrations.
I also removed the hanging weight on my 8.8" diff for a suspension mod, and if my transmission generates a particular vibration, it can resonate for a few seconds. This only happened when the rear main seal on the engine was leaking, and oil got onto the clutch. It got to a point where it was impossible to smoothly engage the clutch, and the
resulting vibrations would shake the whole car for a few seconds even after engagement. Now with a new clutch that engages smoothly, the resonance happens only when I release is the wrong way.
I also removed the hanging weight on my 8.8" diff for a suspension mod, and if my transmission generates a particular vibration, it can resonate for a few seconds. This only happened when the rear main seal on the engine was leaking, and oil got onto the clutch. It got to a point where it was impossible to smoothly engage the clutch, and the
resulting vibrations would shake the whole car for a few seconds even after engagement. Now with a new clutch that engages smoothly, the resonance happens only when I release is the wrong way.
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