[pesurrena]

My daily driver 1987 924s had a terrible problem today. When I put it in drive (it's an auto, I know....) it makes a bad chatter and slowly increases speed. It's ok past 40 or 50mph but from 0-30+ it is almost undriveable. The only reason I drove it was to pick up another car to get me to work. I'm assuming it's the rear. Is this a sign of low fluid or something worse?

I can't work on it until after work so I would like to have a good direction since there's only a few hours of light left.