Re: T-case noise
May I advise? I would recommend you drain a small amount of lube into a clean coffee can or cup and check for metal. Gears don't usually just start whinning (as long as they have never been run low on grease.) It most often starts as a bearing starting to fail which can cause a whine. An early intercession can certainly save replacement of some very expensive gears. Also, don't overlook the possibility that the noise is coming from the rearend. It can really sound like a transmission. Do the same lube check for metal.
88 Sam 4.16,welded rear,lock-rite frnt,31"Hi-tech muds on Ford truck wagon wheels, 4.5 spoa,5k quick mount Ramsey