The modifications continue out back where a beefy Ford 9-inch replaces the stock Spicer model 41 rear axle. With it's splined hubs and two-piece axle shafts, the Spicer can be frustrating to work on, plus its strength is marginal behind any V-8 swap. Everybody knows shocks work best when mounted near the outboard ends of the axle. Who knows what the guys were thinking when they whipped up this funky installation. Also, 1957 marked the adoption of 12-volt electrical systems in all Jeep vehicles though 6-volt systems were still available for technophobes.