that SLAM is most likely causing internal damage. Probably should do that. If there is ATF on the floor. You are low on fluid. Shouldn't drive it low on fluid. First matter at hand, figure out where its leaking from because no matter what else you do if its leaking your burnt. Second change filter and fluid.
If you still are having problems(which you very well might), might be looking at a new valve body or trans.
I think the 98 vr6 has an 01m like my 2000 vr6
Very reliable transmission :sarcasm:
If your gonna end up needing a new trans just do a 5 speed swap.