When I drive my pickup it move of then it just start to rev out no response from drive nor reverse. so I decide to service the transmission but i cannot seem to get off the pan because it it attach to the part where the level check goes. What must I do

Is this an auto trans or manual ?

he's probably got an automatic, and is talking about the dipstick tube. you can unbolt the dipstick tube off the bell housing if it wont seperate, but the dipstick tube is a two piece (or at least was on my 87 4runner) so you should be able to just pull it apart