ALL 745i OWNERS I HAVE A SLIPPING TRANS. IT ONLY SLIPS IN REVERSE AFTER THE CAR HAS BEEN DRIVEN FOR AWHILE. I'VE TAKEN IT TO MY MECHANIC AND HE SAYS I WILL NEED THE TRANS REBUILT AT A COST OF $1600. HE ALSO GAVE ME THE OPTION OF INSTALLING AN E23 TRANS WITHOUT THE HYDRAULIC SHIFT CHANGER. MY QUESTIONS ARE FOR A TRANS REBUILD IS $1600. AVERAGE COST? AND IS THERE ANY OTHER E23 TRANS THAT CAN BE USED ON THE 745?