I need help in determing the cause a problem I'm having with my 1995 Olds Cutlass Supreme with 4T60E tranny.The problem I'm having is with the transmission shift sequences that have been going on for about a year.The transmission shifts normal for 4or5 days.Then all of sudden,it starts shifting erratic.,shifting from 1and seeming to miss 2nd completely causing a lugging effect.Upon deceleration there's a jerky motion in the car itself.and when I'm preparing to come to a stop it sounds as if the tranny is gonna fall out with all the vibration.I guess it's on the down-shift when it does this.It will perform like this for about a week, then it begins to shift normal .There's no jerky motion on slow down,no noise.It down-shifts normal.Then after 4or5 days,the whole process starts all over again.I've had it scanned for codes with none being detected.Some mechanics say it sounds like an internal problem with some of the control valves,pressure valves,etc
I would like get any ones expert opinion or their experience with a problem like this with the 4T60E tranny and their remedy for getting the problem solved,if at all.