With 4.56's, you run the front tcase in low all the time - gives you the same reduction that a stock sammy case does then.
Are you moving the rear axle? If you can move it about 10", your good to go then. The toy tcase output for the rear is high up, which means you need a little more wheelbase to deal with driveshaft angle.
with dual toy cases, a 2.28 in the front case a 4.7 in the rear he will have enough torque multiplication to break a dana 60 if he tries. even with a 1.3, but i bet he goes to a 4.3 and a auto later on.
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