Starting Conversation with I am in process of finishing my rebuild with my 06 48re and before i was going to place and torque down my valve body I noticed that I forgot to Air check or apply air to each passage way for apply levers and clutch pack pistons if that makes sense. The ATSG Manual shows where to check but doesn’t say if some air should bleed out or bleed off at all . All Sounds and feels well except for the Rear (Forward) Clutch Apply. I can feel a slightest thump compared to the Front (Direct) Clutch apply which is greater , but it bleeds air and bleeds off “Rear (Forward ) Clutch. Any input will be greatly appreciated as I can’t find any information on this here nor online. I will remove and inspect that clutch pack and piston again if it seems not normal just need Opinions and more experience with it , mind you I probably went over this 10 times when installing everything back up to this point but like I did with my Allison and any transmission. You only get one chance to install right.