Originally Posted by 350olds
my 1971 cutlass 350 has developed some sort of vibration. it starts vibrating when i get to 60 mph or more. it makes the whole car vibrate not shake. i was wondering if anyone had any ideas for diagnosing problem? i was thinking drive shaft out of balance or dampner or flywheel? any ideas to find out without replaceing everything?
Yep. Jack up the back wheels and chock the front ones. Run it through the gears to 60 on the speedo, then go to neutral and cut the motor. If it still vibrates, it's the drive shaft or tires/wheels out of balance. If it doesn't, it's the motor or tranny. To find out if it's the tires/wheels, remove them and run it up again.