Mitchell Over Drive 26% or 36%

[Benson]

If engine is noisy and shaky I would look at the balance of the fan especially if it an old steel 4 blade ... they are heavy and really shake the whole car if not well balanced.

Try one of the plastic 5 blade fans if for no other reason than to check for unbalanced.

Plastic blades do less damage to hood and radiator if a blade breaks off.

Although I have never seen a plastic blade break off.