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Update: Clutch Fan
Member Caseyjones suggested installing clutch fan in place of the flex fan that the previous owner installed. This was an interesting suggestion, because flex fans cool well, but they roar as engine RPM's climb.
Before I started the experiment, I got a baseline sound level reading with my smartphone. At 60mph, radio off, and heater fan off, the cab sound level was 72db.
I had a 7 blade fan on hand, but the clutch on it was for an Oldsmobile water pump. I ran to my local O'Reilly and picked up a compatible clutch.
After the installation, I took the truck for another drive. Again, at 60mph, no radio, no heater fan, the sound level was 72db. The clutch fan didn't change the interior sound level.
Now, the really interesting part is that the clutch fan did change the tone of the engine noise. To my ear, the engine tone is lower, with less of a "roar". The cab is still very noisy, but it's easier to listen to the radio now. It will be interesting to see how future sealing, sound deadening, and sound proofing effect the sound level readings. It will be awhile before I get around to the interior work, but I'll try to remember to update this thread with new readings as I go along.
John
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