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92 auto...interstate driving 70-80 car sometimes vibrates like going down a bumpy road...then smooths out like nothing happened...was very infrequent now happening more and more...engine revs fine feels like drivetrain...thanks for any info.
Sometimes (randomly) the car vibrates from the front like a very warped rotor or out of balance ... something.
It only happens at about 80-90mph, and if I slow down to 60 for a few seconds, it goes away and could stay normal for days..
It feels like a warped rotor when you step on the brake, you feel the pulse from the pedal too, but I checked all that stuff and it's good. Besides if it were a warped rotor i'd vibrate always when I brake.. It doesn't..
ps. I have new U/Joints which were changed with a new driveshaft when we changed the rear-end and gears few months ago.