84' 150, 4wd C6. It seems whenever the truck sits over night or long enough to cool, nothing wants to happen when I put it into drive. Seemed to do it more-so during the winter time, but its starting to act up now as well. Does not matter if I put it in D, 2, or 1. It will however take right off if I put it into reverse... no hesitation at all. I thought maybe the clutches are starting to slip, but it doesn't move at all for a good 10 seconds or whatever in forward gears, even if revved some... then it seems to get pressure or grab and all is OK. I'm sure its due for a rebuild, but I'd really like to get some more insight one what might be causing this before I go ahead and tear the thing out sometime. Trans fluid level is ok. I'm guessing its something to do with whatever gives the forward gears pressure, since reverse has no wait to engage... but don't really know much about how the C6 works internally. I've heard from a couple people the seals inside might just be getting hard, but what seals in there would cause forward engagement hesitation while reverse kicks in fine?