not sure about the trans being stuck in two gears at once (not sure how they work inside) but as far as removing the shifter goes if the trans is like mine the tin dome shaped piece at the base of the shifter is what you have to turn. if i recall correctly you just push down and turn it counter clockwise at the same time. i used a pair of channel lock pliers to go this. but you have to be carfull not to mar the surface. hope that helps a little
army truck