When you think the engine is really powerful even my dads one makes that sound. I think it's the parts like airbags, handbrake area which have degraded due to Aging.
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Hi there.
Well because its a auto box you could have a band or pump problem which is in the gear box and is bathed in auto matic fluid oil and that could be your problem as the bands do wear down fast on a lot of cars and BMW with there power that could be you.
So take it to a auto box people and get it checked out.
I would change the viscosity of the oil in the gear box first as if the oil is too heavy the syncro springs cannot handle a quick shift. next check the drain plug magnet for metal bits Lastly check that the clutch operation is spot on and that the clutch is fully disengaging to allow for the fast shift. May mean that you have to put your foot fully to the floor for your fast shifts and not as you see it in the movies. At this stage with you information if the box shifts well under normal conditions then I would tend to discount a faulty box
I am at a loss knowing what gear box your referring to and if the rumbling noise began before or after changing the box. There are many things that could simply be loose underneath a vehicle. A wheel bearing can definitely make a rumbling noise. Sure you changed the right one. Can be hard to tell which one sometimes. Sorry I couldn't help more than I did.
turn the key on and listen for the fuel pump you should hear a humming noise coming from the back of the car if you do not hear it start there if you do hear change your fuel filter
change the transmission speed censor if you go to googl you can find out how to jump the computer to make it tell you the engine an tranny codes an the replace what it says is wrong
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