The contents of this book are entirely about the U250E. The U140, U240, U150 and the U151 transmissions all share the same internal components with a few minor differences. Always match the parts that come out of the transmission you are working on. Some of the planetary gear sets have different ratios. The instructions in this book may be used to assemble these transmissions as well as the U250. These instructions DO NOT include valvebody illustrations for the variations of the “U_ series. Only the U250 valve body illustrations are presented in this publication.