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Message: [QUOTE="tbsimmons, post: 80125, member: 2026"] My tranny temps will climb also when going slow towing the trailer, 18000#, but never that hot. I hardly see the temp below 170 after the tranny is warmed up. I am pretty sure the circuit for cooling is set around that. My 04 ran a little cooler but not much when just cruising down the road. Had 35's with 4.56's in that. Pulling my trailer up hills and such as long as I keep my speed above 35 the hottest I have seen the tranny is about 190. The only thing I have done is the Mag-Hytech pan. Seems like it has worked. This was climbing some steep grades in 105+ heat. Now for the tuning. I dont know what MPH Mike locks the TC up in his tunes, but like above mine is locked at anything above 35 so that might be some of the reason mine stays down. I have 4.88's so I can lock the TC earlier. If you have 3.73 gears and larger tires that is going to put more of a strain towing that much weight behind you more so if you have the same lock up MPH as stock trucks. A lot of torque hitting that clutch plate. With the torque of the 250 tune I am sure if you pushed the truck hard it would slip the TC with that much weight. A lot more power with a loaded truck. To test the coolers on anything I have always just took the lines off and blew either air through it, a tranny cooler cleaner, solvent, etc. then air. I doubt your cooler is blocked. The tranny will get warm if the TC is not locking or staying locked. The cooler is fine for these trucks if everything is working fine. Even with the stock pan and stock tuning I didnt get much above 200 degrees. Might have before I got gauges but the glorified dummy light for a guage didnt move much. I run Innovative's tow tune towing. I dont need more power than that. I have towed a little with the street tune (about 7000#) but the tow does fine for me. [/QUOTE]