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Message: [QUOTE="tbsimmons, post: 651777, member: 2026"] I see what you are saying when the TC unlocks. Mine doesnt unlock till around 38-40. Which would be about your ratio at 50. I like 4.88's loaded, unloaded they suck. I gross in the 28000 range with my truck pulling the fiver. I dont think that a under drive would work unless you can retune your lock up and unlock lower when in tow haul. The truck is going to lock and unlock off MPH, which is the rearend. Now if you can under drive over drive and stay above 50 then you are good. otherwise it is still going to unlock without the tune to lock lower. 4.88's with 37's would get you damn close to 4.30's with stock tires. I have 4.88's with 245's. Helps some but not enough unloaded. With what you have done to the truck is the power moved up at all? If it is might need a little more RPM that what you are thinking. [/QUOTE]

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