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The gearboxes are different too, but tcase is the same. Rear driveshafts are a little different but you can sort them out easy enough. And either driveshaft will do the job, when I did mine I used the 4.2 driveshaft and simply swapped the rear diff flange for the one off my 4.2 donor vehicle. If you used the 2.8 driveshaft you may need to swap the Tcase flange end??