To change crankshaft rear oil seal, remove the automatic transmission flexplate, and discard the crankshaft rear oil seal (141). For correct installation, pay attention to the orientation of the oil seal that has a reverse-lip form with the text of the part number on the external side. Check part number markings on the seal, making sure the seal is orientated correctly. Mount the J 41479 cone and bolts, securing them to the rear of the crankshaft while holding the bolts tight but not over tightening. Next, install the rear oil seal onto the tapered cone with the part number markings away from the engine so as to push the seal to the rear seal bore. Thread the threaded rod J 41479 through the tapered cone till it is at the oil seal, and then align your oil seal into the tool. Rotate the handle of the tool clockwise until the seal enters the rear cover, and bottoms into the cover bore. Lastly, take off the J 41479 and refit the automatic transmission flexplate.