My 99 528i auto had a strong vibration in between 1st and 2nd gears and a slight vibration between 2nd and 3rd gears. I replaced the giubo (flex disc) and the trans. mounts. They looked good with no visible damage. I tried to change center support mount but I couldn't taje the drive shaft apart. The 18mm bolt was too much for me to remove it. It looks good though, no visible damage. I did a atf change and when I was almost done putting the pan back to the transmission, one of the bolts stripped the threads, so now the pan is missing one bolt. The vibration is gone though.
UPDATE: I wanted to mention that after the diy the car has way better acceleration response time then before, off the line and while driving. Specially once on the freeway, there's no hesitation whatsoever.
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