Driving me nuts!!

So far we fitted new prop-shaft
Changed gearbox oil and filter, old oil came out clean no particles or smth like that.
Changed diff oil, same story clean oil.
Wheels turn freely, drive shafts have no play.

The only option can think of is that the F*#ing gearbox itself makes this rumbling noise around 80kmph, then it disappears to come back at 140kmph.

Putting the box in neutral at 85kmph does reduce it a little but its still there.

Any ideas before i set fire to the car?

 

How are you sure it is a driveline rumble ?

 

Tire noise frustrated me last year. The noise I had was reminiscent of running snow tires or that of a wheel bearing going bad. Put on a new set of tires and silence followed. As the new tires wear in - about 20k miles now - some noise is creaping back in.

I also noticed what felt like carrier bearing - heavy source vibration - that went away after I changed the spark plugs. That was after 100k miles on the originals.

I'm thinking the structure overall is very sensitive to vibration harmonics and noises/vibrations can come from almost anywhere besides where you might expect.

 

i m having the same problem .. i started off as a whinning noise ... now developed into more of a rumbling noise like u mentioned .. it only appears at 80km/h ... at first i thought its wheel bearing .. now it seems not the case .. anyone have more experience?