Recently my truck has been acting a little odd. Coming down the interstate the other day pulling my 18' aluminum boat my truck wouldn't shift correctly. Whenever it would try to pull a hill it would shift out of overdrive, the RPMs would come up but it wouldn't go. It felt as though the truck wasn't going into gear. I could hear something cutting on like a fan or something but I'm not familiar enough with the whole drivetrain deal to understand it all.

I checked the fluid and it may have been a little low but I didn't think it was enogh to matter. I added about a half of quart of trans oil to it and it hasn't done this since. However I haven't been pulling anything either.

BUT recently I've also noticed that if I get on the throttle hard, when the truck goes to shift from 1st to 2nd it seems little it gets stuck between gears. It will pick up RPMS and a light grey smoke will come out the tail pipe. This is the only time I ever see this, otherwise it is usually black. If I come of the throttle and get back on it a little lighter it will act fine.

Any idea what is going on? I don't think this is normal...............