OEM TSB 7 blade fan - 55037650AA
OEM TSB Fan clutch 05066177AA
Those work, to bad you cant get them anymore...
Actually, I just bought the 7 blade fan today from here...
Brand new OEM parts. A bit pricey but willing to pay for that. Not happy at all with the 6 bladed fan from Flex. Too noisy. The blade pitch is just right on the 7 blade fan since it matches the original TSB fan part exactly so I'm expecting the same results. The TSB warns of increased fan noise so we'll see how much compared to the old 5 blade.
It's seems to me that the Explorer's fan placement on the Explorer hasn't been measured either. Those having issues with that fan might measure the distance from the rad to the fan as installed on the Explorer and take note of the position of the fan within the shroud before assuming too much on the Jeeps. As Chris and a couple of others have found, the set of the fan relative to the shroud is important to create the "venturi effect". Too far in the fan cavitates with the air between the rad and the fan. Too far out and it cavitates with air being drawn from the edges of the fan around the shroud's perimeter. The fan also needs to be the correct diameter to the shroud's opening, blade pitch and fan speed. Lots of variables to consider that you can't just throw parts at and expect positive results.
That being said, my plan is to test the new 7 blade fan with the stock clutch, which appears to be heavy duty according to my build sheet's information about the cooling system (2 core aluminum rad with plastic tanks) to see if that's what the TSB really did. It seems they replaced the clutch anyway but since there's no Severe Duty version of the clutch listed for Jeep, I suspect the clutch was replaced as a warranted exchange to ensure the clutch would not fail after the TSB was applied.
If this does not offer the results expected as Jeep intended then I'll install the Severe Duty clutch with the 7 blade fan and test that. Hopefully all my parts will be at home while I keep on truckin' to get home for a week. I'll try to post an update.
"No army can win against an idea who's time has come."