1989 Chev Suburban Vibration - Drive Train & Driveline

Question: Hello, I have had my rear end rebuilt, the torque converter replaced along with the flywheel and a new drive shaft installed (I don't know much about the new drive shaft except my mechanic says it's straight as an arrow). Problem: From 0 to about 35/40mph the ride is fine; at 40 to about 55 it vibrates; from about 57 to nearly 65 it's the smoothest ride of all; from then on the vibrations increase with the most at 75 plus mph. The vivrations are felt in my rear end and seem "harmonic" or wave like. What do you think it is--do these Chevy suburbans have this kind of problem? I just want to go fishing but I can't drive the freeway. Herb Dreyer

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Technican: Herb, I would first take jack the rear of the truck in the air, block the front wheels, put it in 2WD and drive the truck to 75MPH. You should feel the vibration if it is anywhere in the rear drivetrain. Next take off your wheels and try it again. If the vibration is gone, balance your rear tires and check for bent axle flanges. If you still have the vibration, remove the rear driveshaft, put a drain pan under the transmission tail, put it in 4WD with the front end off the ground and check again. With some trial and error (time, not parts) you can narrow down the vibration to its source.

Owner: Thank you for the info--I do not have 4WD? Herb

Technican: Great, That will make your life a bit easier! Just forget the lines about 2wd and 4wd. The whole process is the same except you won't need to jack the front end.

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