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Message: [QUOTE="TyCorr, post: 1172532, member: 1451"] Thats the tradeoff of having large tires. I have things both ways. Im not trying to dissuade him from his 37s but rather trying to help him understand how best to live with them. With stock fuel my 7.3 had 37s and was as expected pretty shttiy due to power to rolling resistance relationship. It was fine in hotter tunes. Adding another 100hp of fuel made the issue even less of an issue. Now 3.73 and dropping down to a 35 with 500+ hp is PERFECT! There is nothing to be desired. Im assuming a 6l with 190/100s has plenty of power to be had....with a 37" tire I think a 4.10 would be his best balance of nice cruising rpm and nit being undergeared. 4.30s maybe but now if you do any sustained interstate driving you've got a modded, piped, lifted, noisy as diesel running an rpm where molars begin to rattle. [/QUOTE]

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