Has anyone had any issues with towing or hauling heavy loads. Is there any modifications to fix the problems. I've heard the transmissions over heat fairly easy. I've never had a problem until yesterday. I have a 2011 Titan SV with about 73,000 miles. I do not have the tow package so I max out at around 7500 lbs. The transmission got hot when I was hauling up a mile long grade. It was at the line on the hot side. It went right back down as soon as I hit the top. It definitely didn't seem like it was working hard. I had the truck in tow mode and approx 700lbs in the bed. I have a trailer I tow that is about 5000 lbs. Fully loaded. I've never taken it up any grades just flat so far. My older Titan I had never had an issue towing up grades but it had the tow package. Any suggestions?