LOWEST BEST PRICE

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WHAT WOULD BE THE BEST PRICE TO REBUILD MY TRANSMISSION IF IT CAN'T BE FIXED EASILY? THE CHECK ENGINE LIGHT COMES ON AND STAYS ON AFTER DRIVING FOR A FEW MINUTES. IT SHAKES AND SURGES WHEN SHIFTING INTO 3RD AND 4TH GEARS. WHEN IT SHAKES ITS LIKE A MOUNT IS BROKEN. THE FLUID IS CLEAN AND FULL. ( BUT THE CAR WAS STOLEN A FEW MONTHS BACK) AND IT HAS 162OOO MILES ON THE CAR.