Our '87 190Dt started to make some noise from the back of the car, more likely from where the rear end is. When the car accelerate from standstill (for exmaplen at a stop sign), the car feels being dragged, the engine RPM goes up but the actual car speed does not seem to go up and there is this churning sound from the back of the car. This happens mostly where the car makes right-hand turn from at the stop sign.
I have replaced all brake pads and flushed the brake system thinking it was a dragging pad but it didn't seem to solve the problem. I am planning on to go back to lube the caliper pins to see if it would help. Could it be a sign that the differential or the axles are failing? It gives me a feeling the rear end wasn't engaged and the transmission spins without load when this happens. Or could it be failing companion coupling at the drive shaft or even the differential mount? Car has about 250k miles on it. Both the engine mounts and transmission mount were replaced not long ago. Tan '87 190Dt '91 300D
