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Message: [QUOTE="Addicted4, post: 1554317, member: 7471"] Well my 250/80’s in my economy tune pulls 12k pretty good. My 35’s and 3.73 means I either have to tow at 72-75mph to keep the rpm up or run 62-65 in 3rd climbing a grade. This is a economy tune not a tow tune. Will it build heat, absolutely in overdrive at 15-1600 rpms 1250-1300*, but if you downshift holds about 1000* with a little rpm. This is only when pulling a grade 4-7% not flat ground. No smoke that is visible. Stock turbo charger with 332k miles. Next time I tow I will use my tow tune and get a better idea. The biggest thing is that the tow tune downshifts pretty much anytime you try to accelerate moderately that’s why I don’t use it often. Imagine a decent drop in or 364.5 turbo and 33’s or 4.10 or 4.30 you would have a towing machine with no issues. [/QUOTE]

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