Okay so my dad is working on his D4 7u. He pulled the engine and is rebuilding it. He noticed the input shaft to the transmission was a little loose and decided to continue tearing down into the transmission to evaluate its condition. It turns out the input shaft bearing was worn out and the housing for that bearing was damaged. He noticed about 1/16 inch end play on the gears on the counter shaft. The gears seemed to be unnecessarily sliding back and forth. He went ahead a took apart the counter shaft and found nothing out of the ordinary the gears look good, the spline on the shaft is smooth all the way along. The Cat service manual does not address end play allowance for this shaft. Does anyone have any experience here? When it comes to Cat parts and gears sliding around loosely it just doesn't seem to fit. Every where else it seems like you need a 20 ton press to work on it. Open to what other people have experience. By the way he has a full machine shop so he can make modify or fix anything so don't hold back a suggestion because you doubt the tools are available.