So I'm working on the camaro which is now my friend's but once was mine. It's got a supposedly very well built 700R4. The engine is probably around 450hp, give or take a bit. It has TransGo shift kit and 2200rpm stall converter. When it first did it last night, it didn't feel like it was trying to shift into 3rd at all. That was good news to me because I figured it was either the governor or sticking valve in the valve body. I pulled the governor, sprayed it with carb cleaner. Put it back in and took it for a drive. At really light throttle, it tries to shift into 3rd but there's nothing there so it goes right back into 2nd. Is this for sure a bad 3-4 clutch pack or could it be something easy like an accumulator?