Yeah ive read that with OD off its just like 5.13s.
I find with my OD off withs 3.73s though im running very close to 3000rpms when doing around 100km(60mph) Which drastically drops my mpg. That said, its looking like 5.13s would just be too much for hwy driving. Once this is a dedicated trail rig maybe 5.13s, but by then might as well just go d44 with 5.38s.
Yes OD off with 33" is too much but gives you an idea what 5.13 would be like. I run 24-2500rpm at 60mph.
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
I think your opinion will change. I've regeared a couple rigs from 4.10 to 4.88 and 3.73 to 4.56, and around town it didn't make as big of an impact as I thought it would. But off road, towing, or climbing passes it made a huge difference. Much less downshifting and lugging.
Have you recalibrated for the gear change?
No off road or passes yet, my city is pretty much sea level + or - a couple 100 feet.
I'll have to go to Yosemite on the Tioga side again one of these days. Back then when I had 4:10s and 32s, hauling 3 people plus camping gear, I had my foot mashed to the floor in first gear and I think I was going like 30-40MPH and it would not pick up any more speed. 3k elevation gain in less than 10 miles.
I run 5.!3's in my 2011 JKUR with 35" KM2's (actually measure around 33.75"). If I baby it I can get almost 16MPG highway, mixed driving is 13.5 - 14.5 MPG
X2. I got almost identical specs on my 09 with 5.13s and 35" KM2s with 3.5" lift and slightly less for 4.5" lift. I also used a performance programmer. The 5.13s were perfectly matched to the smallish 35s but it would be overkill for 33s.
I am running 37's, an auto, on 5.38 gears (Rubicon w/ D44 front and rear). I wouldn't go any less.
It is not my DD, but nevertheless, if it was, I'd still stick with the 5.38's. Barely any difference in gas mileage between 5.38's and 5.13's. At 70 mph, I am running 2450 RPM's. Right in the sweet spot.
2008 2-dr Rubicon, auto,
RK 2.5" Max Travel, Rancho 9000XL shocks, 37" Nittos, 5.38's, RR skids, Warn VR8000-S.
RIPP Gen 2 Stg 2 Supercharger. Political Correctness offends me.
It drives just a hair better than it did when it was stock with 32in tires and 4.10's
If i didn't have a long drive to work or this was a weekend toy i would have went 5.13's
My gas mileage is about the same as stock maybe .5 worse but i'm heavier too
MY NEW JEEP- 2011 JEEP JKUR, Body Armor front bumper, Warn XD9000I winch, Synthetic winch line,XRC Rear Bumper W/Tire carrier, OBA W/1Gal Tank, Terafex 2.5in spring lift, Bilstein 5100 shocks,GY 315/70R17 Duratracs, 4.88 G2 gears, Cobra 75 CB
MY OLD JEEP-1999 Wrangler Sport 4.0L, 4" Pro Comp Lift, 33" BFG's, 8K winch, SYE, Viking soft top, onboard CO2 and all the recovery straps and equipment
I ran my stock 32s on 5.13s (35s in the summer for off road and using up the stock tires in winter on road). On the 32s It is peppy, fun to drive (yea a wrangler that can get "scratch"!) and gets 16ish mpg (15 ish on the 35s), but I do have a heavy foot in traffic. I don't drive over 75MPH though....
I ended up trading my stocks for 35 Hankooks on stock wheels just so I don't have to reprogram when I go from fun mode to work mode. I do miss that pep...
J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a hard knock...
Went 5.38s on my 2010 JKUR, automatic, 35s, daily driver. Disappointed with the power increase. 4:10 with OD off drove around town better than 5.38 with OD on. 4th gear ratio is just too high and it still feels like I'm lugging the engine and now my exhaust drones like crazy since I stay around 1500 RPMs. The only thing I felt like I got out of my regear was the reuse of OD on the freeway. City mpg stayed the same, haven't taken any out of town trips yet.
I went with 5.13 gears. I would say it is my best upgrade by far.