I've got a nice one (Tekonsha) that I've been meaning to install for almost a year... the only hard part is finding where to mount it (I don't wanna block the radiator any more). The rest is just unhooking your tranny line to the stock cooler in the radiator (do all years/models have this???) and running it to the aftermarket cooler. Then go from the aftermarket cooler back to the stock one. That's about it... good mod really and I got mine for like $50.
Billy