No you cannot. The outut shaft on a 4x4 is different then the output shaft on a two wheel drive. they have different spline counts and the 4x4 Tranny has a different extension housing to bolt the...
sounds like your heater core, real pain to get to, have to take the whole dash out to get to it... before you jump to that though check your thermostat and antifreeze level.
If you mean a 5 speed manual box, then it is a job not to b undertaken lightly. You will require a manual such as Haynes but even then it would not normally cover all the internals of a transmission...