Nice ride! I just picked up an 08 4.8 as well love it. I don't want to come off the wrong way but I disagree with reusing transmission fluid. First 62k is not what I would consider high mileage and second there is no dirt in the fluid that is going to keep your transmission running. Also if your coolant is mixed with tap water get it out ASAP. Many think the crap in tap water has some bearing in the coolant pipe failure.
FWIW I have changed the transmission oil in all my cars foreign and domestic with new filters around 100k and all automatics I have still perform flawlessly. My old X5 was at 170k when I traded it in on the new E70, my Dodge is at 150k and my f350 is at 200k ( its ready for another trans filter and oil change as soon as it warms up).
Either way this is just my opinion and results Good Luck
