To change the T-case fluid is really easy. i went shopping and picked up 3 quarts of Valvoline transfer case fluid. i know the manual calls for ATF+4 but well i didn't listen.
ALWAYS remove the fill bolt first. it's a Allen wrench of size that eludes my thoughts right now. All to often i've seen people drain the t-case first then can't get the fill bolt out.
now after that's been removed, you can safely remove the drain bolt and drain the t-case. i put a larger red funnel under mine to help guide the fluid through the skid plate. after it's drained. reinstall the drain bolt, and start pumping the quoted 2 quarts in. Just as my rear dif i filled mine about 1/4 or so more then the suggested 2 quarts. reinstall the fill bolt. Clean your tools. enjoy
total time about 10-15 minutes.