Vibrations when driving

[Satellite65]

Had the same issue with my street driven '65. After correcting the pinion angle to 3* nose down, in relation to the crankshaft, problem gone. Based on your sequence of events though, it does sound like you have a driveshaft problem. Be sure that your shaft is not too short as well as being true and balanced.

Me too. At one time I had a '66 or later K frame in my '65 which pitched the trans tail down, equivelant to the pinion being nose up. Once I put the correct K in it, the driveline angles were correct and the problem went away.

I also had a light throttle cruise surge issue which caused a similar symptom. The carb (Holley 3310) was jetted a little on the lean side and at certain speeds the car would surge, vacuum would drop, power valve would open and richen up the mixture, engine would smooth out, vacuum would increase, power valve would close and the whole process would repeat itself. Going up one jet size on the primary solved that problem

 

[tommy smith]

I have been rackin my head on this. i have a pulsing vibration when driving. i recently replaced the shocks on my 65 coronet 440 thinking that this would fix the problem and it partially did, however i still have this vibration. best way i can describe it is that its like the shivers (when u get cold) it is rhythmic, in a sense.couple seconds of "the shiver" the couple sec of nothing and then the shivering vibration...i can see the hood vibrate, the wipers vibrate, my steering wheel vibrates, the dash vibrates, i can feel it under my feet.. but if i gun it for a sec it will go away and then when i let off its back again. wheel balancing???
please help i want to drive my car without worry!

Thanks

sounds like u-joints

 

[65coronet440]

I have a updated thread...."the shakin 65 coronet"