Posts: 492
Threads: 69
Joined: Aug 2020
All I know is when I changed out 458 to the direct drive it moves a noticeably more air on low than the old fan did.
Brad Aden
2003 Newell #653 Quad Slide Cat C-12 engine
Towing 2020 Grand Cherokee Summit
St. Louis, MO
Posts: 1,132
Threads: 151
Joined: Sep 2021
I am sure it does as I felt air rushing past my head while I was playing with the speed switch! I guess it being so much quieter, makes me "think" it's not the same although the CFM specs say it is. I love this upgrade and never have to worry about a belt slipping off or the noise!
--Simon
1993 8v92TA #312
