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5500 NAPCO front ???
1969 USAF GMC5500 with NAPCO front axle (7.20 ratio) believe it's an Eaton. What numerically smaller gearset could I use to make this beast more highway-able? It can't be that easy as installing a ring gear/pinion from a rear axle of similar weight rating, can it?
Any input appreciated!
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1969 ES5500 B E A S T 1976 K20 Suburban
1983 C10 'farm truck' 1984 K10 Suburban
1988 V30 Fire Truck
1941 Dodge WC18 Ambulance
2000 GMC Bus (parts warehouse)
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