Steering Vibration Part 2
Continuing from August 23, 2011...
PLEASE...Any and all help is appreciated.
1951 Chevy 3100 P-U that has been resto modded with 350/350, 700r4, 10 bolt rear end, Mustang II rack, 245-40-18 KMC wheels and Nitto tires and all of the other stuff to complete the job. In August after purchasing this truck I had a serious vibration that started about 62 MPH and lasted to about 68. Steering wheel shakes like hell and all kinds of noises come from the steering column. Since then, I and others have looked everywhere on the truck and and found the following defective and/or not right. First, the truck had its front end lowered with 2 inch drop spindles and was only a few inches off the ground. After some serious looking, we found that the lower control arms had a radical pitch upward because the wrong coil springs were installed. We changed the springs and the vibration was still there. Secondly we found that because the springs were wrong it put excessive pressure on the upper and lower ball joints and all four were totally destroyed. They were changed. Vibrations still there. Third, we replaced all four tires and wheels with 15 inch steel wheels and almost new tires to rule out my current set up. Vibration was still alive and well. Forth, we changed the drive shaft, checked all angles and installed new universal joints. The vibration is still there.
We have gone through the truck and looked at everything that we thought could cause this vibration and as a last resort, we put about 300 pounds in the bed of the truck over the axle and took it for a ride. The vibration was gone. Now I am told that the vibration is caused by harmonics. This is now out of my league and I don't know where to look to find the cause of the harmonics causing this steering wheel to jump all over the place.
If you have any idea please let me know. Thanks, Richard