2002 Acura TL Tranny slippng @35mph when @D5 but ok @ D4

3 weeks ago all my tranny fluids burst out while running in the highway @ 90mph. Had it towed home, checked out the following day, found 6 or more screw got loose. Tightened them and had the tranny flushed ( 2x with reg. Dextron III and the 3rd is Z1 from honda). The car runs good @ D4 but @ D5 trans slips @ 30mph. Engine vibrates also @55mph whether @ D4 or D5 unless you accelerate at that speed. I noticed that engine oil is also leaking underneath by the bolts, where the seal is, at the bottom of the engine. Tightend them, but still leaking. Please advised me on how to approach this problem.