Now you can take the shims out of the old collar and put them into the new collar. In theory, you should measure the distance from the face of the input collar to the shims and make them the same between the input collars. The shims are there to put the proper preload on the input shaft bearing. If you have them too loose, the bearing will rattle around and live a very unhappy life. If the bearing is loaded too tight, it will burn up in short order. We usually just take a quick measurement to make sure things are OK. We have never found a problem...BUT, you better measure, just in case. Notice everything is CLEAN that Sandwich is working on. The old (longer) input collar is on the right in this picture.
