You may even be able to buy a complete external tranny cooler kit for it still, from Holden or an external source. For the maxlife fluid, you need to find a place that can do a powerflush of the old fluid and put maxlife in. It will cost about $150 or so but worth it. The oil runs much cooler than the normal mineral version. The thing that can kill them is towing in 4th gear, where the torque converter keeps locking in and out. I'd have a look at it pretty quickly if I were you.