Jeep Wrangler Forum banner

Opinions on 4.10 with 285/70-17

6K views 23 replies 17 participants last post by  Darth61 
#1 ·
So I've read lots of threads on gears and tires. I'm looking to get an auto 2017 JKUHR later this year. Will be ordering because the ones on the lot don't have exactly what I'm looking for and most have 3.73 gears. This will be my DD and am trying to ease into mods. To start I'm thinking teraflex leveling kit, spidertrax wheel spacers and bfg ko2 in 285/70-17 then in a couple years maybe move to 35's. My question for anyone with a similar setup is how does it drive on the highway and will it be too much gears with the 285's? Are the rpms screaming at 70? Not overly concerned with mpg. Just looking for opinions on drivability since I'm trying to justify going with 4.10s and want to make best choice. Thanks
 
#2 ·
It depends on how soon you'd want to go w/ 35s. If you know you'll move to 35s soon, you'd likely want 4.56 or possibly even 4.88. In that case, don't start w/ the 4.10. If you think it may take a while, then the 4.10 would be a much better interim choice.
 
#3 ·
I ran 285/70-17 on my 14 jkur with 4.10 and the 3.6L likes to rev with no ill effects on mpg. anything under 80 and you are not going to feel like you are over reving.
 
#4 ·
My wife's '15 JKUR has 4:10 with 315/70-17 with a Mopar 2" lift and plenty of weight from bumpers, winch and skid plates. At 80 on the highway the RPMs are at about 2600. Occasionally it will down shift going up a grade and the RPMs are at 3100 to 3200. The wife drives her JKUR everyday and loves it. I think with what you are looking to do you'll be fine.
 
#8 ·
My DD 2015 JKUR is 3.73 on 285/70/17's. At 400 feet elevation it works just fine. Power is plentiful but you have to put your foot into it (which I think is just the JK experience).

I ordered it with 3.73 and plans to go no bigger than 285's.

A month ago, while at 500 - 7000 feet elevation power was definitely down. It still climbed hills just fine but it was a slow-lane keep on a plugin' sort of thing rather than fast land pass 'em all.

If you are thinking you'll eventually be on 35's you should seriously consider 4.10 gears. Otherwise odds of needing to regear are pretty high.
 
#10 · (Edited)
I'm on 4.10 in a JKUR on stock sized tyres, and its fine at 70mph on those. Rev counter sits just above the 'eco' zone and doesn't feel stressed at all. 285/70R17 is on my roadmap.

Edit: I just drove to work this morning and at 70mph I'm running at about 2600rpm which is right on the top limits of the 'green eco' zone on my tacho.
 
#11 ·
I have a manual 4.10 JKUR and just went FROM DT 285/70/17(31.5") to Toyo 285/75/17(33"). I would say my jeep performs all around better with the larger tire... I like where 5th and 6th gear are RPMs wise. Also 4LO is now better for me. I rarely needed 1st in Rubi 4L, now for crawling it is useful.
 
#12 ·
It will be quite good. I run 4.10s with 35s and it isn't enough but I do live in the mountains and drive at altitude. Assuming you're a flatlander, it will be solid.
 
#15 ·
Just did Toyo AT2 285/75/17 with 4.10's I have no issue with shift points I did not re calibrate and actual speed is 2 mph higher than the speedo, which I can live with for now
 
#16 ·
You might want to re-think the TF leveling kit if you are thinking the "performance" leveling kit that uses springs instead of spacers. Your JKURHR is going to be at the heaviest of all stock Wranglers and the TF performance leveling kit does not live well under that weight. The 4.10's are a great choice and you won't be over geared for highway use with "33's" as long as you can live with 80mph or less.
 
#17 ·
Was planning on the Teraflex leveling with spacers. Not the performance spring version. Just shooting for a little lift to handle the 285/70's and give it a more aggressive level look. At this point totally sold on the 4.10. I do kind of wish the bfg ko2 had slightly larger sizes, like a 295. But that would probably just open up a new can of worms for me.
 
#18 ·
I'm running the BFG K02's in 285/70R17 (32.7" tall) on my daily driver with 4.10 gears and it's great. I do plan to go up to the 35's (actual 34.5") when these are done.
 
#20 · (Edited)
4.10's will do great for you now and in the future with 35's. I have had 35's and 4.10's for almost 4 years now and they work well. I am at altitude, and I do great off-road or on road.

If you decide on 37's then you might want to go for lower gearing.
 
#23 ·
The reason many do really well off road with 4.10s is those are Rubicons with the 4:1 transfer-case ratio. That ratio is what makes the Rubicon so good off road. The other t-cases will not be the same, even with 4.10 or 4.56 gearing. If you have light 35s, that makes it even better. I don't like mine as soon as I get (highway) above 8,000 feet. It struggles on the highway and passes just like my 2012 Rubicon did (same gearing and tires). It will work though, and for some it will actually be fine. If you're not climbing passes at 8,000+ feet, it is a decent gearing for many (not me...4.56 would be my choice unless this 3.6 had more torque). When I go to 37s, I'll definitely go to 4.88s. That's my experience with two Rubicons (2012 JKR and 2014 JKUR) and pretty much all higher-altitude driving. The only reason I have not regeared is the potential move to 37s.
 
#24 ·
I have been worried about what gears I would want once I installed my 35". I gotta say, other than turning 2250 at 70 instead of 2480, I don't even notice a differance. At this point, I'm just keeping the 4:10's.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top