1995 Ford Explorer

Transmission problem
1995 Ford Explorer 6 cyl Four Wheel Drive Automatic 168000 miles

when driving the explorer I hear a roaring sound it will not pick up speed but as I continue to press the gas it will finally kick/jeck and then pick up speed. Then a few minutes later it starts all over doining the same thing. Please help what could this be
February 18, 2008.

TSB# 97-11-11 for 4R70W tranny states. Erratic or prolonged 1-2 shift.
94-97 Mustang and others. Replace the cast aluminum piston with the one piece stamped steel piston with bonded lip seals and replace the top accumulator spring. This is due to 1-2 accumulator bore scuffing the revised piston can be used in the scuffed seal bore.
Don't know if this pertains to you or not. What speeds are involved?

Feb 18, 2008.