I use my stock 96, auto, 3:55, to pull a 36 ft KIT Patio Hauler, including the 93 Soft Tail and the wife’s shoes I figure I`m pulling 13k+ lbs. In the costal plains around the gulf coast have not experienced any problems and have been pretty pleased with my purchase. (used with 48k mile). On a recent trip through Tx and NM I experienced a high temp situation as I pulled north out of Santa Fe up a long stretch to Taos. My temp was peaking as I reached the top of the pass. Anyway, need input on cause and potential solutions. I noted one post where the owner had his radiator cleaned out and changed his thermostat as a solution??. I`m definitely interested in more HP but want to start out with a solid base. One other issue that I have noticed is that after the truck sits up a few days I have to idle for a minute or so prior to the auto engaging?? Is this an indicator of a pending transmission problem. Thanks in advance for any replies.