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Message: [QUOTE="Tree Trimmer, post: 53196, member: 716"] while thats true, he is doin what he has to, with what he can afford, cuz what he has is simply not enough for what he needs. doesnt change the fact that he needs a 6.0 cooler when he can afford it, hauling the loads he is. i have a E99 f250 automatic, 3.73 rear end, no cooling through the radiator. when i had the stock cooler, i would get hot, like you have. towing round bales, 11 of them at about 1900/bale + a 3k trailer = way more than the truck should pull. :D 250-275* was real easy to get to real fast. you can get around that by not letting it shift. when driving through a field, keep it in first. when driving down the road, keep it a gear low and the rpms up. shifting is what is creating all your heat. that bein said, i have put the 6.0 cooler on it. same loads, same fields, same hot days, cannot break 220*, even letting it shift. again, that temp, that fast is maybe a tad fast, but i drive 15 miles to work, country driving, and im at 140* on a 65* morning. so your not as fast as you think. now about your two coolers on it. i would prefer the one on the left over the one on the right. hd cooler or not, imo, i dont like it. when you look at your pics, the fins on the one on the right are farther apart, and thicker. yes, it lets more air through it, ill give you that. because the fins are thicker, it takes more air to cool them, and while more air will flow through that cooler, the ic behind it and the radiator behind that will limit any additional flow that one would have gotten. because you have less # of fins, you have less surface area of fin to dissipate heat. more/thinner fins is better than less/thicker fins. and a suggestion. if you know a tranny guy, and are friends with one, if you go to a bone yard and get a ac condensor, you know that thing that your coolers are in front of in your pic, he can flush that thoroughly and you can use that as a tranny cooler. i did that as a "i wonder" moment to a truck at work that has never come off the trailer its hooked to. it works better than the 6.0 cooler on my truck. if you focused on your ac condensor, its HUGE, much bigger than the 6.0 cooler. the catch is, you really have to trust your tranny guy to flush the cooler. if there is any ac stuff left in there is will chit the trans right quick and in a hurry. [/QUOTE]