Hello, Could you guys please give me a quick run-down on the Warn overdrive? My 1970 CJ5 has this unit installed on my T-case (D18 I'm assuming). Does the overdrive have oil of its own, or is it using the oil from the T-case? How do you shift the overdrive? While moving, stopped, etc? Can you use the overdrive low range in combo with 4wd Hi and LO? Sorry if these questions have been answered before - just a newb here looking for some instruction! Thanks!