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The Dynatrac front axle was already complete and proven off road, but we needed to drop down from last year's 5.13 gear ratio to a 4.88 gear that I preferred, especially with a big-block that could make up for less gear. Yukon Gears were stuffed around the ARB Air Locker and the Pro Rock was buttoned back up. In the rear, a van-width 14-bolt (3 inches wider than the 3/4-ton truck axle) had become a likely candidate, so a Yukon Gear spool and 4.88 gear setup were packed into the axle by Fenzel. What we had here is one of the first versions of the Yukon Gear spool, and the one you will order comes as a solid ring at the gear instead of being scalloped like ours was.