Believe me, the fan noise is the least of your worries when in it comes to driving an AD truck. Wind noise, valve clatter, creaks, squeaks , and rattles will cover up any noise coming from the fan. Stick with the 4 blade factory fan. If you have cooling issues, look elsewhere because the fan ain't the problem.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)