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Message: [QUOTE="Tree Trimmer, post: 18789, member: 716"] if your trans guages hits 230* back off, stop, do something. you can run 220* for about 30 mins before the heat starts to damage things. mark kovlovsky(think i spelled it right), former ford transmission engineer(think the guy(s) who designed the damn thing), has ran one at 300* for short durations and not seen negative effects. its the prolonged exposure to the heat that kills them. or backing up, baking it, and shutting the truck off. when backing up a trailer, if you push the go pedal and it doesnt move easy, go to 4lo. you dont need to lock in the front end, you need the gear reduction. backing up a heavy load, having to push to half throttle to get it to move, will generate a chit ton of heat real fast. i backed up my skidloader, bout 11k trailer and skid loader, up a small hill, less than 15* of angle yes thats almost flat, about 50ft and i was at about 260*. it took about 10 secs. if you do get it that hot, backing up, drop the trailer, and take it for a short ride down the road. get some air moving across the cooler, dont just let it sit in the driveway running. when pulling a trailer in drive, 70% of your heat will come because the truck is shifting. pulling hills, and it down shifts to go up the hill, then up shifts to go down it. once or twice is no biggy. pulling rolling hills like that will generate lots of heat. take it out of od, leave it in third, dont let it shift, and it will run cooler, not to mention its easier on the trans. if you know your just gonna go up the hill again as soon as you get to the bottom, just leave it in third. you should also get some engine braking also to help you down, less you have some coast clutch issues. for normal driving, 80-100* over ambient is normal. pulling you will run hotter. stop and go traffic you will run hotter. <--thats cuz its shifting, and starting from a stop. if you feel you have trans heat issues, get another/different cooler. common ones are the 6.0 cooler, and the tru-cool. the tru cool is cheaper, though not as large, the 6.0 cooler is almost the size of your ac condensor, and more expensive. mild towing, the tru cool is more than adequite. heavy towing, spend the cash, get the 6.0 cooler. and for the guy with the discrepency of temps across multiple guages. two guages will [B]rarely [/B]match temps. boost will almost always be spot on, but temps will vary. its common to see +/- 20* ish between two guages. its all in how the companies set their tolerances, materials they used, etc etc. you ever used two different brands of wrenches and one fit kinda loose and the other fit real well? i mean not sloppy, just didnt feel right, made you check the next size just to make sure you were right? same principle. [/QUOTE]