Hey all, so I tried my hand at rebuilding my th400. Rebuild went quite well I thought, with the help of the workbench how to series book. Got it all back together and in the truck. It shifts great! Problem I noticed though. It has a whine. I can tell it is not a hard part, it sounds like hydraulics. When starting the truck cold it has this whine all the time and continues until the Trans is at operating temp. Then it only whines in 1st and 2nd above 2k rpm. On top of that you can hear the planetary whine like it normally did before, so i can rule that out. What could cause this? Fluid level is perfect on the line. I hauled a trailer with the new transmission for the first time last week and it worked exceptionally well. Should I even worry about it?