I got a new aftermarket 10 blade fan blade cheap and wanted to test it out vs the 9 blade. First bit of info is that it sits WAY back vs the Dorman 9 blade fan. The Dorman fits perfectly 50/50 in/out of the shroud vs the 10 blade fan which sits more like 25/75 in/out. I haven't taken it for a drive yet, but I'm not sure if it's going to cool as nice as the 9 blade due to the location of the fan blade to the shroud.
I'm starting to come to the conclusion of 9 blade Dorman fan blade on Jeeps with a MML and 10 blade fan for Jeeps without an MML.
05 Electric Lime Green LJ with a 4spd Auto, 2.5inch Suspension Lift, OME Shocks, OME Steering Stabilizer, 32inch BFG M/T's on 17inch Moab's using Spidertrax Spacers, UCF Aluminum TC Skid, Novak Cable Shifter, Brown Dog MML, Rokmen 1/2 BL, Banks CAI, Diehard Platinum Marine Battery, JW Speaker 8700 LED Head Lights, Safari Nets, G.E.A.R Overhead Console/G.E.A.R Tailgate Storage, Rugged Ridge XHD Front Bumper, Warn Gas Tank Skid, Mopar Rock Crawler Rear Bumper, Warn XD9000i Winch with Warn Wireless Remote, and a Uniden 880 CB Radio