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I have researched the eaton ho 52 and ho72 and you can buy a ring and pinion but the highest is 390's. if you want to know the diference between a 72 and a 52 the 72 has a adjustable screw on the drivers side of the third member.
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1972 K20 custom camper 4x4 LWB 396 700r4
1965 chevy II 420 hp s/b 4 speed
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