Can anyone give me some advice? I have a 1988 300TE with 139000 miles on the clock. There is no knocking but there is vibration and the whine is only present when accelerating - as soon as I back off the gas and drive at a steady speed it's all quiet again. So.....is it the diff or prop? Or a failed drive shaft bearing? How big a job? How much? Any advice would be great it has been to 3 garages and each has come up with different things one thought it might need a complete new prop, someone else said that it it is in excellent condition including the rubber do-nut in the centre, someone else thought it might be the diff in the back axle, and another the gearbox. I would like to keep the vehicle going but it would help if I had some idea of the problem without running into serious money. Thanks Mark. Any advice appreciated.