M30 Transmission

[M30TOBY]

I HAVE A 1991 M30. FOR SOME TIME NOW I HAVE HAD A PROBLEM WITH THE TRANSMISSION SHIFTING LATE IN FIRST AND SHAKING BEFORE COMING TO A COMPLETE STOP. I DECIDED TO TAKE TO TRANSMISSION SHOP WHERE UPON IT WAS DECIDED THAT I HAD INTERNAL PROBLEMS. I AGREED TO LET THEM REBUILD IT. THE COSTS SOON BEGAN TO MOUNT. THE ORIGINAL QUOTE WAS ABOUT $1,800 THEN AFTER THEY GOT IN TO IT I NEEDED A NEW PLANETARY GEAR. AFTER THE SMOKE CLEARED AND AFTER TAXES, I WAS UP TO $3,000. IT STAYED IN THE SHOP FOR ALMOST 2 WEEKS. WHEN I PICKED IT UP LAST WEEK I COULDN'T TELL A WHOLE LOT OF DIFFERENCE (EXCEPT FOR MY BILLFOLD!). I TOOK IT BACK TO THE TRANSMISSION SHOP AND TOLD THEM THAT IT WAS STILL SHIFTING LATE IN 1ST AND IT SHOOK RIGHT BEFORE COMING TO A COMPLETE STOP. THEY HOOKED UP THEIR COMPUTER UNDER THE DASH AND TOOK OFF. THE COMPUTER INDICATED THAT THE TRANSMISSION WAS DOING WHAT IT WAS TOLD TO DO.....1ST (SHIFTED LATE), 2ND, 3RD AND 4TH. COMING TO A STOP......4TH, 3RD, THEN SHOOK, AND 1ST. IT SKIPPED 2ND EVERYTIME. WE PUT A NEW TCU IN IT AND THAT MADE NO DIFFERENCE. DOES ANYBODY HAVE ANY IDEAS WHY THIS IS HAPPENING. PLEASE!