Vibration while idling in park

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Mar 27, 2024
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Tupelo, MS
My Car
1973 Mustang Mach 1
I have a 1973 Mach 1 Q code and I noticed at fast idle of 1600-1700 rpm in park you can feel a recurring vibration. Any ideas? I had a similar one on my son's 2006 and I replaced the counterbalance and it fixed the problem.

I'm going to act like my wife telling me what is wrong with it. It goes, "waaaa, waaaa, waaaa, waaaa", about a second to second and a half apart - continuiously. When driving you can't feel it while its pulling (gaining speed) until you get to a cruising speed of about 45 then it is like it is above. It has a c-6 auto and a 4:10 rear end.

This afternoon I am going to start at the harmonic balancer and go through all accessory drives and cooling fan looking for the problem.

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