ok, so something to make note of on my fzj8o I bypassed my trans cooler for a few weeks as the line had a pin hole. I run a trans temp gauge. During that time I noticed my operating temps were crazy high all the time. Like 230 poking along in slow farm roads. I cant imagine what the temps would be like in heavy prolonged traffic. Towing would be out of the question. So if your buying a truck like this with no tow package which comes with the tranny cooler, I really think your buying a very cooked unit. conversly with my oil cooler my temps never got above 215 towing 5000lbs up an 8% grade for 5 minutes unlocked. Huge difference in operating temps.