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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments            Search Questions:    stock56gmc      3.73 rear swap,1956 gmc 3/4 ton stock 270, 4 speed, 8 lug rear 41.5" spring center, want to find a 3.73 rear for a bit better highway cruising speed. posted: December 3, 2010       Answers (1)   retiredpartsman      61 to 72 carrier assembly with 4.11 ratio will fit but driveshaft is 3/4 inch different in length .that is the lowest ratio that fits your housing .you might try finding a 73 or newer pick up and compare spring mount distance, and with to your axle .frame width was same for many years. posted:  December 10, 2010

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