I have noticed that everyone seems to really worry about getting the fill plug out of the manual transmission before changing the gear oil. Then you have to use a fluid pump to fill it. I have always just removed the shifter from inside the cab. It just takes about 5 minutes to take out. Im not sure if it is different for 4x4's but in mine you just remove the shift knob pop off the cup holder console and then the shifter console(they just pop out) then unbolt the shifter. After that you just pour the fluid in through the shifter opening. It takes a little slow pouring but definatley faster than laying under your truck with a pump. Any thoughts?