when i am accelerating (mainly in the 1st gear but also in the 2nd) around 2000RPM, i can feel this rumbling (also not very strong noise) that transfers to the front seats from around the middle of the car. can that be a bad differential? or some loose bolts? what should i check first?
and by the way. where should a get some cheap manual pump to change the manual transmission oil?
<span style='font-size:13pt;line-height:100%'><span style='font-family:Arial'>'87 325i Convertible</span></span>