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Are you just looking for lower revs? The 2.47 is already pretty low rev at highway speeds...in 4th gear. You may end up using more fuel by lowering the rpms too far in final drive by lugging the motor. A normal 560 would probably handle it fine, but a lower output 500 not so sure about that....you'd be likely looking at 2000rpm or less at 75mph with a 5th gear.
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