Responding to this thread as my name was mentioned in the initial post. There are several fan clutch options as mentioned. There is another variable that has not been mentioned. That other variable is the depth (or "height" if you will) of the water pump. I found out the hard way that they are not all the same. I had ordered a water pump from Summit Racing and installed it on my J only to discover after installation that it was a 1/4 inch "taller" than the old Mopar pump I had replaced, and the fan/clutch no longer cleared the radiator. Consequently, I had to install the "low profile" fan clutch that Mike linked to (2947). The 2947 is an HD clutch and worked fine, but is more difficult to install because the shaft or hub is so short. My only other observation about the 2947 is that it was noticeably noisier than a standard duty clutch, and was partially engaged almost all the time, which I have not seen on the 2747 which is also an HD but not noisy, at least on my '62. Anyway, my point is that results may differ even among the same model car (J, K) due to variability in the water pump dimensions.
That said, I installed the 2747 on a '62, which may have more available space between the water pump and the radiator than a J or K. As I recall, the J and K don't have a lot of space to work with. The 2747 is a much "taller" clutch than the 2947. Here is a "height" dimension summary of the thermal fan clutches that have been mentioned as potentially suitable:
2765: 2.67" standard duty
2947: 2.71" heavy duty
2747: 3.34" heavy duty
2797: 3.66" severe duty
Carl
------ Original Message ------
Date 8/6/2026 9:35:38 PM
Subject Re: {Chrysler 300} Fan shroud for 300K?
This is the one Hayden is marketing with extra clearance. I haven't tried one yet myself you can see the measurements to verify.
Thanks but in Looking at the specs online It looks like the 2797 is actually longer than the 2747 so that would t work.
Keith
On Aug 6, 2026, at 8:48 PM, Kevin deGraauw <kdegraauw@xxxxxxxxxxx> wrote:
Go with a 2797- should fit and its a severe duty thermal. They market this as the " cooler for your hot rod" and it's just like the infamous mid 80s jaguar clutch but less internal slippage.
Kevin D.
From: 'Keith Langendorfer' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Thursday, 06 August 2026 18:37:01
To: Carl Bilter <cbilter@xxxxxxxxx>; Club International Chrysler <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Fan shroud for 300K?
Carl and Club
So, I bought a Hayden 2747 and went to install it but it’s 1/2” too long and would jam against the radiator core so it won’t work on our non A/C 300K. I knew it was a tight fit with the current unit (the clearance is so tight I couldn’t even
squeeze my finger in between the current clutch and the radiator core to see if there was a thermo spring).
I was hoping that the new unit would work there. Alas, it doesn’t. That said, I will say it’s a beautiful unit and certainly looks superior to the old thermo unit that’s currently on the car (to Carl’s point) and am hoping that someone can recommend
an alternative Hayden unit that will squeeze in there .
Any suggestions would be most appreciated!
Keith
On Jul 14, 2026, at 2:58 PM, Carl Bilter <cbilter@xxxxxxxxx> wrote:
John is correct re. the non-A/C cars, and on top of that many came with the 4 blade fan instead of the 7 blade fan. The 7 blade fan moves a LOT more air. On my '62 non-A/C 300 with no shroud, I upgraded the 4 blade fan with no fan clutch to a 7 blade
fan and used a HD thermal fan clutch (Hayden 2747). The HD clutch has much higher spin resistance than the standard duty clutch and begins engaging at a lower temperature (air temperature in front of the clutch, not coolant temperature in the radiator).
Even without a shroud, coolant temp stays very consistent and no need to change the radiator and thermostat housing. But adding a shroud is even better. The letter cars used a non-thermal fan clutch into the '63 model year with a running change to thermal.
A thermal clutch is superior to the non-thermal.
Carl B.
------ Original Message ------
Date 7/14/2026 1:03:23 PM
Subject Re: {Chrysler 300} Fan shroud for 300K?
I never had a J or K, but from my experience with 60-62 vehicles, the non-A/C cars didn't have fan shrouds, and the A/C cars had fan shrouds that were designed to accommodate the radiator hose on the far
passenger side of the top tank. A/C cars also had viscous fans while non-A/C cars did not. The exception was high performance letter cars without A/C that had the A/C style viscous fans, but no shroud. I guess that was because the letter cars were expected
to be running at higher rpm, with or without A/C, so it was felt the viscous fan was needed either way. When I moved to TX, I began investigating adding a shroud to my non-A/C G. I bought a shroud at Carlisle and slightly modified it where necessary to
clear the upper hose, and it bolted on just as it would on an A/C radiator. Probably the "right" way to do it would be to get an A/C radiator and fan shroud, and change the thermostat housing and upper hose to look like an A/C car that is missing the compressor
for the best form and function. I had once parted out a 62 New Yorker with A/C, and had hung on to the radiator and shroud for years without using it (my G coupe I had at the time was factory A/C, so already had the correct radiator and fan shroud). I finally
sold the A/C radiator and shroud at Carlisle years ago, before selling my G coupe and getting a non-A/C convertible G and moving to Texas. Go figure!
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