I have a 1991 535i that I've kept in great condition for the last six years I've owned it. Regular maintenance on everything. Most people literally think it's only a couple of years old. Anyway, every so often, the auto tranny decides to start making a sort of banging noise as it downshifts into first gear when coming to a stop. All other times, the tranny shifts fine, smoothly and easily going up and down the gears. But then, all of the sudden, it will just start banging that one downshift. Personally, I think it's an electronics glitch, since it can come and go and the tranny always works fine most of the time. I'd love to identify the problem and fix it, but need a bit of help since I am definitely not an auto tranny expert. Can anyone out there offer any advice about this problem?

Grace and peace,

Robert K
1991 535i