( 1991 Ford F150 with elec. windows.) My door widows work fine but sometimes as it gets almost all the way down it gets real slow and I need to help push it. I have had panels off and may have something too tight, I know it's lubed well. Anyone know why?

 

Have a look at the rubber channels it slides up and down in. They might be a bit swollen near the bottom.
White lithium grease in the metal channel on the bottom of the window and silicone in the rubber channels.

 

It seems to try to push the post over towards my side window and it hangs about 3" from the bottom unless I help it.

 

You'll have to pull your door panel off and check the channel that it slides up and down in. It sounds like there may be a problem down there that's restricting the window. Could be the rubber insert in the channel is damaged. Sometimes the metal outer channel will start to rust a bit behind the rubber and make the whole channel a little too tight for the window to slide through easily.
Sounds like something like that might be happening - that front slide channel is part of the frame for your vent window so that would make sense from what you describe.

 

Ok thanks when I catch a warm day I will take that panel off.