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.
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.
