Wow... hard to believe someone would get that extreme with a rig and not have put in the tcase gears at some point.

Automotive Customizers (4x4parts.com) makes a set now, too at 3.7:1 - though the Calmini 3.98:1 are tried and true... and slightly lower.
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Warning! Do not sear the top of your neck hole in the molten lactate extract of hoofed mammals.