driveline vibration TE71

[jondee86]

teun Wrote:Could worn motor mounts be the culprit here?

It's possible. While you are under the car take a tire lever or similar tool
and use it to lift the back of the gearbox a bit. Examine the mount rubbers
for breaks, softness from oil etc. Then do the same for the engine mounts
looking for excessive movement.

Driveshaft vibrations are notoriously difficult to diagnose. All the rotating
parts from crank pulley to rear axles are coupled together into a single
system, and the vibrations can be caused by anything from engine firing
pulses to an out of balance rear wheel.

Engine induced vibration can usually be eliminated by pushing in the
clutch and selecting neutral (or coasting down a long grade). If the
vibration remains, it is not caused by the engine. Wheel vibrations can be
isolated by swapping the front wheels to the rear axle. If it can be done
safely, raise the back of the car, put the rear axle on jackstands, chock
the front wheels and run the car in gear. Slowly increase the speed while
watching under the car to see what starts to shake.

The driveshaft itself can be bent, universals seized, hanger bearing loose
or seized, flange bolts loose, or as Ivan said, a balance weight could have
fallen off. If close inspection and vigorous shaking to detect any slop fails
to find a reason, then probably getting the driveshaft re-balanced would
be the next step.

Cheers... jondee86