Slow shifting between Hi & reverse

It's 20* today and we screwed around the neighborhood and lake. We got around 18" probably total in the last 24 hours on top of what was already on the ground so we decided to head out for a bit.

Most of the lake/park roads had been driven on but there were a few areas that were untouched. We only were out for abour 30 min slow riding and we stopped to watch the sunset.

We headed home, nearly got high centered getting in the back yard but when I pulled up to my garage I was trying to compact the snow by going back/forth and engagement from High to reverse was slow. The first time I shifted, the dash light showed "R", I gave it some gas it there was a god awful racket and the dash indicator went nuts. I've heard transfer cases not being fully engaged so I knew it was an engagement issue. Revs came down, R showed up and I felt the engagement and was able to pack it down like I wanted.

We were out a few weeks ago, in snow again, and 4hi engagement was clunky. We were going up a slippery hill, I flipped 4wd and I got a little grind and a clunk. I stopped, hesitantly, while going up this slippery hill as I didn't want to get stranded by breaking something. 4wd showed on the dash, I gassed it some and it started climbing then a few more clunkys, it felt like it was disengaging/engaging and once topping the hill. I stopped, went 2wd, then back to 4wd and it proceeded to work fine.

Whats the deal w/ what I'm presuming are delayed engagements. Dean had the AC shop change fluids before I picked it up, and I did read a few thread of folks complaining about AC fluid quality. Do I need to change to Mobil or a better fluid? Is this a common issue in very cold temps?

The engaging/disengaging is hard on parts = potential breakage. I got this to wheel. I looked at the Kawi but its too wide for local trails, litterally, the XX rubbed the tires going between several trees on a local 64" trail so a 64" machine was our goal and the suspension is solidly built.

Any thoughts or ideas? S[email protected] you're a trans/diff guy, what say you?