|
2012 JKU Rubi 410's vs 373's
Which ratio should I go with? The dealer says that the 373's are standard and recommended for up to a 36" tire. I am thinking the 410's would be better. It will be on an automatic FWIW..
|
3.73 on a rubi? I was always under the impression they came standard with 4.10s:thinking:
|
Get the 4.10 unless you only drive highway flat surfaces.
|
My '12 has 4.10's. It seems perfect with 35s. If you aren't gonna get bigger tires I think 3.73s would get better fuel mileage, I guess you have to figure out your future plans and go from there.
|
Originally Posted by wcfd111
(Post 2749645)
3.73 on a rubi? I was always under the impression they came standard with 4.10s:thinking:
|
Gonna go with 35's. Plus I already have front and rear bumpers and a 125 pound Warn power plant. I am thinking 410's. I was just looking for confirmation on my decision. Or for someone to tell me that I was a DA and the 410's weren't necessary.
|
I think you're headed in the right direction. I'm very happy with my choice of 4.10s.
|
Get the 4.10's.
|
The 2012's come standard with the 373's unless you get the max tow package that upgrades to 410's. I had the dealers search a 500 mile radius when I was buying, and couldn't find exactly what I wanted. I ended up with 321's on my sahara and plan to upgrade.
What mileage are you guys getting with the 373's and 35's versus 410's and 35's on a 2012 with an auto? |
With 4.10s, 35s and an auto I get mid 15 mpgs combined driving. I'm pretty happy with that. I only have 1300 miles on mine, it may get even better.
|
If you plan on 35's, go 4.10's!!!! The reason I say that is this-
Original tires are 32's, divide the new tires' diameter at 35" by the oem (32"), multiply that by 3.73 (the gear ratio Jeep has standard for JK's with 32's) and you come up with dang close to 4.10! Thus, it's like compensating for bigger tires by going with deeper gears but, you haven't had to change a dang thing! To me, that just makes good sense! This is not a direct comparison since mine's an '11 but, mine is completely livable with 35's and 4.10's but I can tell it'd be HORRIBLE if I had 3.73's!!! (it's no speed demon either way, LOL!) |
That's it, I'm sold. 410's it is!!
|
Definitely go with the 4.10's
|
Am debating on 373 or 410 gearing on 2012 JKU Rubi I'm trading my 2010 JKU Rubi in for. Will be running no larger than 33" tires, but live in high altitude WY with not much flat driving. Off road doubt if it would make any difference either way with the new motor & trans, especially with the added reduction of the Rubicon 4 Lo, but at 70 mph I wonder if the difference in rpm would be enough to make the 373 a better choice. Knowing just what the rpm is at 70 mph on both 373 & the 410 on the same stock tires would help me make the decision. Anyone know?
|
If you look under the Modified Tech FAQ thread there's a comparison chart for the gears vs tire size ratio with respect to rpm at 70mph. And I believe it's been updated with a separate chart for the 2012 motor.
Now in my opinion I have the 373's and wish I had the 410's. Even with stock 32's I have to down shift for moderate inclines. |
Thanks for the reply. I'm also leaning toward the 410 with the 5 speed auto. Not saying a new gear, speed, rpm ratio chart has not been made for the 2012 in the Modified Tech Forum, but if it is I can't find it & have spent considerable time looking & that's the reason I asked if anyone knew what the rpm's are at 70 mph.
|
Dealer I bought from said they never saw a rubi w/anything but 4.10's.
Mine didn't come w/max tow package, no extra charge for 4.10's. 4.10's is the only way to have a rubi in my book no matter what. I like to hear the muds bark once in awhile when I want them to from a dead stop :wink: |
Just picked up my 2012 Rubi Unlimited tonight. Mine is bone stock for a rubi, the only option I got was automatic transmission. Mine came with 4.10's No extra charge. Most I looked at were 3.23's. I had to search a while to find it.
|
Congratulations on the new Rubi. My 2010 had about all the goodies you can get stock. Didn't care for the fancy leather or navigation system. Will use a Garmin which I much prefer on the 2012 & save some big bucks. Still hoping for an answer to the rpm at 70 mph with the auto & 410 gearing. Hearing others personal satisfaction is somewhat helpful but more so to me is the actual numbers.
|
On the way home I was running between 70-75mph and I think I was running around 2800????? I will have to pay more attention on my way to work tomorrow.
|
Much thanks. Will be looking forward to seeing the numbers tomorrow. My 2010 is 2080 at 70 mph & think about 300 hundred more would have been a lot better. New 5 speed with the OD being lower geared should create significant higher rpm with the same 410 gearing. Thinking the sweet spot should be around 2400 at 70 mph, so the reason for the request of both the 373 & 410. The 2400 at 70 perhaps is not the sweet spot, so if not why?
|
After 8,800 miles on my '12 Rubi Unlimited with 4.10's and a 6 speed, I have averaged 18.3mpg, living at 8,000 ft.
The gearing is a bit short in town, and on the highway the best "cruising" speed seems to be about 55 to be in the ideal place for fuel economy. That being said, at 80mph, I am just above 3k rpm which is not ideal. If I go to 35's way down the road, that will be a different story. Stock, 6 speed with 4.10's, there is more than enough power everywhere. With the gear ratios being so short, and I had to do it over, I probably would have picked up an auto, but I am very happy with my selection. Hope this helps! |
Originally Posted by WY-JK10
Much thanks. Will be looking forward to seeing the numbers tomorrow. My 2010 is 2080 at 70 mph & think about 300 hundred more would have been a lot better. New 5 speed with the OD being lower geared should create significant higher rpm with the same 410 gearing. Thinking the sweet spot should be around 2400 at 70 mph, so the reason for the request of both the 373 & 410. The 2400 at 70 perhaps is not the sweet spot, so if not why?
|
I am on my second 2012. On the first one it was a $50 option I thought it was the same on my current one. I have heard now that it is a free option. I am happy with the 4.10's in a currently stock 4 door and plan to keep them when I go to 35's.
|
Originally Posted by EK's JK
(Post 2749722)
That's it, I'm sold. 410's it is!!
|
Originally Posted by EK's JK
On the way to work this morning I was going 70mph on a flat highway turning 2400rpm's. I think it is the sweet spot. When I accelerated at 2400rpm's the jeep was very responsive. Like driving a stick of butter!! |
NOt to thread jack but, the 2010 JKU Rubicons come with 3.73 then?
|
what is standard on the 2012 rubi has been confusing, but i think its the 4:10s. early on looked at some online stickers and with max tow package with 3.73s there was a $50 extra to get 4:10s. mine didn't have the max tow and came with 4:10s, no extra, nothing extra listed in the options regarding gears. since i did't see an extra i assumed i had 3:73s until i looked on the standard side of the window sticker that says 4:10s. with the lower geared auto i would have liked the 3:73s for the better mpg, but i'm happy with the 4:10s, awesome crawler.
|
Yes confusing. My dealer says the 373 is standard & the 410 comes with the max tow. Showed that too when I built my own on the jeep website. Think the reasoning is now with lower auto transmission gearing & added hp the stock jeep Rubicon for average use is better suited with 373. with stock tires the new 373 turns 200 more rpm at 70 mph than the 07-11 with 410.
|
4.10's in 07 Sahara auto
One of the options that sealed the deal on our '07 Sahara auto was 4.10 gears - and it doesn't have the tow pkg. It's my wife's DD around town and so averages 15-16 mpg. Does better on longer trips but we still have the advantage of 4.10's off road. (Running stock BFG Rubi takeoffs now)
|
My 2012 auto with 4.10 was 2700 rpm @ 70 mph with the Rubicon 32" tires bone stock
Now I'm running 35" tires and leaning toward 4.56 gears which will be within 20 rpm of the factory 4.10 and 32" tires I'm sure the 4.10 will be great for most people even with 35's but I'm Going to be pulling a 3500 lb trailer Most weekends during summer Sent from my iPhone |
Originally Posted by WY-JK10
Thanks again. Finally found the gear-rpm charts in the Modified Tech FAQ. It was hiding in plain sight. Feel kinda dumb for it taking me so long. Anyway am surprised the 2400 you reported does not match the chart. With the 3.8 in my 2010 I get exactly what the chart says I should with 410 gears & auto trans with stock Rubi tires, 2080 rpm at 70 mph. The chart for the 3.6 says 2533 with same set up, so hope your number is the more accurate. Would be good to hear from others on this. From the chart layout it appears a true 2400 would be the sweet spot for my use just as I had thought before viewing it. 2400 to 2600 is all close enough to make the 410 the preferred gear ratio for me. It works well for my altitude use now & if I get the urge to go bigger tires in the future will still be great. Love my 2010 Rubi & I'm retired & on a slim budget, but I think this change is well worth the money. Hope to keep the 2012 the rest of my life & think this motor & trans combo is much more likely to hold up the 20 or so years I hope to have left than my 2010. |
| All times are GMT -8. The time now is 09:32 AM. |
© 2024 MH Sub I, LLC dba Internet Brands