1998 Other Plymouth Models Recently had new filter and fluid

Old fluid was brown and it has been a couple years since the filter was changed.
Had the filter and fluid changed yesterday. Today going to work, while the car 'runs' smoothly, there are annoying spikes in the acceleration, the passing gear pops in and out, and the speedometer won't work most of the time.
The speedometer thing makes the speedometer jump, register only a percentage of the speed, or not register at all.
I 'think' and it is only an educated guess maybe there is too much fluid in the tranny. I really think I need it looked at.