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You need to use the 4.2 box as the 2.8 is too light duty for the extra torque of the 4.2.

2.8 box is based off a Nissan passenger car

Mic

You can use the 4.2 gbox with the 2.8 transfer.

No they don't make them. It's more so the 2.8 box won't be as reliable behind a 4.2 as a 4.2's box. The difference is quite substantial