I hear you about the trans mine has 184k & I'm keeping my fingers crossed. After thinking about it give some thought to the high idle tune, I used it quite a bit in the summer to spin the A/C. BTW I pulled a 9-10k horse trailer 3800 miles this summer on the 80dd no probs temps stayed great. Whatever you decide I'd be willing to bet you'll be happy with Bill's tunes 
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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