Re: 1964 Chevelle vibration between 50-70 MPH
I found my pinion bearings were worn. This and a slightly worn u joint caused vibration. I noticed it right away after the swap, because I had been driving a new car for a while during the swap.. I have had out of balance drums, bent wheels, poorly machined axles; all cause vibration. I was able to eliminated the problems.. It takes a methodical approach. Did this car vibrate before the drive line change? If not, it *must* be the components you changed. You can raise the rear axle and support with Jack stands. Run the speed up to 60. THIS IS DANGEROUS. But it will tell you a lot. If the vibration is gone, it was your front wheels etc. I suspect it is not. But, if it still vibrates, you can let it idle in gear and check for bent rims etc. ARE the wheels balanced? Thrown weights?? Driveline is higher frequency than wheel or tire vibration. My 78 elcamino had 1 bent rim, and I ended up buying 2 salvage yard axles, and one brand new axle to eliminate wheel wobble. Old cars...........be careful and good luck.