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My advice is to get it built, then replace the rear end as needed. If your load is very low at your desired speed, you need a lower numerical rear. With an engine as large as 8.1L you may not be able to get a rear end that's tall enough. But, maybe you will. Worst case is that the engine is simply too big to get the load you want for good efficiency.
Conversely, if you find you can't reasonably use your top gear, you'll need a less tall rear end, a higher ratio.
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