I have rebuild well over a dozen of these transmissions. First, if the bearing you are talking about is the input shaft main bearing, that is the last part that is removed from the transmission case and the first part that is installed. You rebuild the transmission from the back to the front. Most problems with these transmissions are not the bearings. The problems are usually the input shaft main drive gear, and countercluster main drive gear. I would recommend removing the bottom cover and inspecting the front gear on the countershaft. If those two gears arn't perfect, time for a rebuild. The shifting sequence is first gear is in the back of the maincase, second is next in line third is next fourth is mainshaft locked with input shaft and fifth and reverse are in a special extension housing that is bolted the the maincase. If you rebuild the transmission yourself be verry carfull with the fastners, snaprings, etc. they are no longer avaiable from Ford. All of the snap rings are metric sized and SH heavy duty which means they are thicker than the normal snap rings availble at the auto parts store.