Who has done a 5.7 with a833 4 speed Overdrive ?

AJ/FormS said

It doesn't take a big cam to still be in reversion at 1900, so, don't be expecting fantastic fuel-economy.

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With a G3 and EFI, it's not a problem. The factory setup with a 5.7/6.4 and 6M runs at 1500 rpm at 65 mph and 1700 at 75 mph, way under your threshold. With 3.21 gears, smaller tires and an A833OD, it will actually be turning faster than the factory planned.