Should you get a heavy duty fan clutch?
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Jcrubicon
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I went with the 22159 for more idle lockup hopefully. Much like the 2791 it’s not listed for our tjs but is a direct fit severe duty clutch specd out for the v8 rams I believe. Maybe I’ll pick up a 22160 and see if I can tell the difference for science
Just want to throw my .02¢ in here (a year later). I finally bit the bullet and refreshed my cooling system and put the USMW fan clutch in. There was nothing wrong with the original but for the sake of longevity wanted to shelve it as a spare. I don’t see any difference in volume or performance between the Mopar and the USMW, so as others have found this is much better option than the Hayden. It’s been 100+ here and with the AC going I haven’t had any overheating.
I had mentioned perviously I had a failed USMW fan clutch (out of balance fan ruined it) I replaced with a Toyota OEM on my truck and found no discernible difference between how the OEM performed with the USMW. This is what originally turned me on to eventually using it for my Jeep.
My conclusion is that this is a great OEM equivalent.
I had mentioned perviously I had a failed USMW fan clutch (out of balance fan ruined it) I replaced with a Toyota OEM on my truck and found no discernible difference between how the OEM performed with the USMW. This is what originally turned me on to eventually using it for my Jeep.
My conclusion is that this is a great OEM equivalent.
Waking up this thread, what is the best fan clutch for towing?
Hayden 2771
Hayden 2791
Hayden 2794
I want to free up horsepower, stay cool while crawling and stop and go southwest desert traffic.
Hayden 2771
Hayden 2791
Hayden 2794
I want to free up horsepower, stay cool while crawling and stop and go southwest desert traffic.
I wouldn’t expect the 2771 or 2791 (which I ran for a while) to free up horsepower.
I can’t speak to the 2794.
I'm running a 2771. For my way of driving, the local climate, and my priorities, it is "probably" the best choice for me. Some will hate it because they consider it too loud - it doesn't spin down until around 3200 RPM. I like the extra air, and noticed the difference on the temp gauge over stock - albeit a worn out stock so the comparison isn't "real". I don't care about noise myself. What? Huh? What did you say? 
The 4.0 runs hot,you need the clutch that moves the most air,unfortunately you won’t be freeing up any horsepower.
The Hayden 2794 with motor craft Ford fan is one of the recommended options for cooling performance. Any experience or feedback on the Hayden 2794 with motor craft ford fan?
I'm running a 2771. For my way of driving, the local climate, and my priorities, it is "probably" the best choice for me. Some will hate it because they consider it too loud - it doesn't spin down until around 3200 RPM. I like the extra air, and noticed the difference on the temp gauge over stock - albeit a worn out stock so the comparison isn't "real". I don't care about noise myself. What? Huh? What did you say?
I have the 2771 and it seems to work well. It is a little loud.
I just replaced my fan clutch and the one I took off looked almost identical to the 2791 as opposed to the 2771.
I recently installed the 2791 and have no issues of any kind. No squeal under acceleration or high RPM.
I swapped it for a mopar. I have been trouble free with no belt noise for over a year now. I couldn’t get it stop squealing at hard acceleration. No noise with the mopar with the same belt.
LIke I say, I don't particularly care. The extra air movement is welcome. If someone wants a quiet vehicle, buy an electric!
I had the same issue but on an XJ. When I was young and dumb I saw on other forums people recommended the heavy duty clutch so I tried it. The fan wouldn't unlock no matter what RPM, it sounded like a jet, and any higher than 3000 RPM the belt slipped and squealed it sounded like a supercharger, even after tightening the belt. I bought a Mopar clutch for that Jeep and never had any issues.
I think you have it backwards. I'm pretty sure the 2791 moves more air than the 2771.