To tall. Way too tall. Were fitted simply to achieve the required fuel economy tests, which are only done at 50mph (80km/hr). At highway speeds the wind resistance is too much, at least in the old 3.8.
Personally if you have the option, I would go for the 3.73 or even 4.1's, if you ever want to upgrade to higher in the future (larger wheels for example) then you dont need to change the carrier (3.56 down use a different carrier to 3.73 and up).
Cheers from Downunder, Dave.
2010 Dark Charcoal Pearl 'Renegade' pack (includes dual top options, 17in alloys, side steps etc).
2.5in Flexy springs, Bilstien 5100's, Teraflex rear trackbar bracket, Synergy front and rear sway bar links and front disco kit, Synergy steering damper relocation bracket, AEV front drop brackets, ARB front and rear bar, 10,000lb rope winch, Britax Xray Vision driving lights, GME 3440 UHF radio.
First who really redlines their Jeep. So far I still think I have gone too far at 4,000 during some semi-heavy acceleration.
2012 Sport S 2D manual here. I got 3.73. Because I am counting on one day dragging something behind it. Water toy, camping gear, motorcycle, nephew to school....
I never towed anything, so wanted the best power and safety margins for when I do. I also got the Sport S, with 17" wheels instead of standard 16". If I absolutely never planned on towing anything I would have seriously considered the 3.21. Also, they came with their max tow ratings. Looks like 3.21 are at 1,000 pounds, everything else 3500 I believe for your Unlimiteds. I'm stuck at 2,000 being 2 door.
If you mod and add heavier weight, bigger tires, anything, get the 3.73. If you plan on keeping stock and family daily driver, and you KNOW you will be doing such, then go with 3.21. If any doubt, get 3.73.
For fuel savings, it is not going to matter much either way. Again, for stock.
2012 Sport S 2D, Silver, Hardtop, Manual, Tow, 3.73, Infinity, Air Bags, Power Convenience
Heated Seats, Side Steps, Hood Lock, Gas Cap Lock, Fuel Door
Ordered 6/27/11, D1 6/29/11, Built 7/22/11, Delivered 8/19/11.
Hummer Kills: 6
When I first came upon this site a week AFTER buying my '11 Sport "S" I thought "OH KA-KA!!!" I've screwed up.
Mine came with 3.21's and I then had the dealership add a 2" receiver hitch. I have the 6spd and I have a boat.
Here's what I have found. With a light rig such as a PWC (1) or a skiff, mines a 14' Alu. w/ a 9.9 hp. 4 storke Yamaha on a standard trailer, I have zero problems pulling up any ramp. No issues up hills either.
I agree with "MyKII". With my desired uses, a 6 spd & 3.21's work nicely. Your milage may vary.
This really vehicle isn't a heavy hauler. I think if your looking to do some searious trailer hauling I'd be looking at something in a P/U. My opinion only.
'11 Sahara Tan Sport "S" H/T 6spd