87 Copyright © 2006 ATSG “ 2 0 0 6 ” S E M I N A R I N F O R M A T I O N Automatic Transmission Service Group SLIDE GM/BMW 5L40E TRANSMISSION PARTS DIFFERENCES COMPLAINT: CAUSE: CORRECTION: When the technician is rebuilding a 5L40E transmission from a Cadillac or BMW, some hard parts which may be acquired as “good used” may not fit the particular application being rebuilt. Although the 5L40E may look the same for both the Cadillac and the BMW models, there are   some   very   distinct   dimensional   differences   in   various   parts   that   make interchangeability impossible. Figure 1 illustrates the Cadillac bell housing which also incorporates the pump body. Figure 2 illustrates the BMW bell housing which also incorporates the pump body. Figure 3 Illustrates the different stator shaft lengths between the Cadillac and BMW models. Figure 4 illustrates the different input shaft lengths between the Cadillac and BMW models which is an integral part of the forward drum. Figure 5 Illustrates the BMW pump cover. Figure 6 illustrates the BMW and/or Cadillac pump cover. Figure 7 illustrates the difference in the Line Boost Valve between Cadillac and BMW models which is the outer most valve assembly in the pressure regulator valve line-up located in the pump cover. Many thanks to Paul from Hardparts For Transmissions for his help in providing this information.