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The Dana 20 started phasing out the Spicer 18 with its introduction in 1963. However, Jeep would continue to use both cases until 1971. The Dana 20 has a righthand front output and a centered rear output. Unlike the 2.46:1 low range of the Ford Dana 20s, the Jeep versions had a 2.03:1 low range, although the Ford gears can be swapped.