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Still gonna have the same gap between 4th and 5th ratios even with 4.56 diff, you'll just experience it at a lower road speed for a given shift point.
Too bad the AT has such a wide 4-5 gap, should be more like the MT where you keep 5th gear closer to 4th and then have a wider gap 5th to 6th gear for lower-rpm and higher-mpg for highway cruise.
Only solution is to hold it in 4th longer before upshifting. Upshifting at redline you'll land at 5276 rpm in 5th, shouldn't be a problem with TORBO!
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