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Topic Review (Newest First)
03-02-2012 09:44 PM
Rb1boxer_3 Ok so I plan on running 37s on my 2012 with 3.73s until I save enough to get gears will it be ok I won't drive as much cause im always at work.
02-29-2012 12:28 AM
seanpholman What are you talking about? I have been running 37s on my Dana 30 and 3.21s for 100000 miles, including on the Rubicon.



--Sean
02-29-2012 12:24 AM
ESP Dude, I'm going to bed now. I'm gonna run 35s on my legendary 3.21s till the cows come home.
02-29-2012 12:21 AM
seanpholman Much better.

--Sean
02-29-2012 12:19 AM
ESP I picked the wrong smiley.
02-29-2012 12:04 AM
seanpholman
Quote:
Originally Posted by seanpholman View Post
Having a Dana 44 diff has nothing to do with the gear ratio you want.
I re-read my own post and am guessing you latched on to this sentence above. What I should have done is completed it by adding ....ratio you want to run.

If this is the issue you are having with my post, then I apologize for not being more clear earlier. Otherwise I have no idea what your problem is.

--Sean
02-28-2012 11:54 PM
ESP
Quote:
Originally Posted by seanpholman View Post
Good point, I incorrectly assumed he said 35s. I re-read his post and see he never mentioned tire size. That is indeed my mistake.

But you didn't correct me on anything. What differential you have only affects available gearing, not what gearing you should run. That was my point. Aren't internet forums fun?

Smyln, what tire size are you wanting to run? Obviously it is a crucial part of the conversation that is missing.

--Sean
02-28-2012 11:50 PM
seanpholman Good point, I incorrectly assumed he said 35s. I re-read his post and see he never mentioned tire size. That is indeed my mistake. Probably came from the conversation about 35s I was having at the same time.

But you didn't correct me on anything. What differential you have only affects available gearing, not what gearing you should run. That was my point. Aren't internet forums fun?

Smyln, what tire size are you wanting to run? Obviously it is a crucial part of the conversation that is missing.

--Sean
02-28-2012 11:42 PM
ESP
Quote:
Originally Posted by seanpholman View Post
Your comment is irrelevant because he is not close to needing the lowest gear ratios available for either diff. 5.13s are too deep for a 2012 running 35s. I have real-world experience with various '12 JKs with different axle ratio setups.

--Sean
You are absolutely wrong when you said the diffs have nothing to do with ratio. You cannot stuff 5.38s in a D30 and if you try we'll...good luck with that. It is only relevant because you stated it. I corrected you and that's it. Since the OP never mentioned running 35s or 37s, recommendations from you regarding these tire choices are irrelevant.
02-28-2012 11:33 PM
seanpholman
Quote:
Originally Posted by Smyln View Post
Sean is yours an auto?

Yeah, I am not sure if 4.56 or 4.88. Knowing that I rock crawl and highway drive daily at 80mph and tow, I want to find the sweet spot.
I am leaning toward the 4.88s for you, but nothing deeper.

Mine is a manual with 4.88s and 37s. My '07 is a manual with 5.13s and 37s. The '12 kicks the '07s ass and gets better fuel economy doing it. I also had 4.88s and 35s with the '07. So far I have driven every JK configurations stock, as well as '12s in the following: stock w/3.21s, Auto/4.10s/Stock, Man/4.10s/Stock, Auto/4.10s/35s, Auto/4.88s/35s, Man/4.88s/37s.

Wheeling and JKs are not my hobby. I do this day in and day out every day for my job and I promise you I know what I am recommending here.

--Sean
02-28-2012 11:31 PM
seanpholman
Quote:
Originally Posted by ESP View Post
Your front axle does determine how far you can go with gears. Since the OP is running a D44 for both he is not limited to 5.13 with his front like a sport or sahara with the D30.

4.88s are the a correct ratio for a manual but not for an auto. You should not be looking at those gears for your transmission. Search the board here and you will find out why.
Your comment is irrelevant because he is not close to needing the lowest gear ratios available for either diff. 5.13s are too deep for a 2012 running 35s. I have real-world experience with various '12 JKs with different axle ratio setups. The chart is a great resource, but not an end-all, be-all. You have other variables to factor in.

As fast as the OP says he drives, 5.13s will be spinning too high on the highway and fuel economy will suffer.

--Sean
02-28-2012 11:21 PM
Arcticshaun
Quote:
Originally Posted by Smyln

Sean is yours an auto?

Yeah, I am not sure if 4.56 or 4.88. Knowing that I rock crawl and highway drive daily at 80mph and tow, I want to find the sweet spot.
If you drive 80 go 456
02-28-2012 11:16 PM
Smyln
Quote:
Originally Posted by seanpholman View Post
Yeah, 4.56s are hard to find, but they are out there. Superior and US Gear now have them, I believe. Because the WA580 tranny has such a wide ratio spread, you can get away with 4.10s and 35s depending on use. IF you live in flat areas, drive mostly highway, and don't load your Jeep down with weight (bumpers, armor, etc.), 4.10s and 35s would be adequate. I know it sounds crazy, but the 3.6/Auto/4.10s is still geared lower overall than the 3.8/Auto/4.88s.

For your use, it sounds like you might even be a candidate for 4.88s, but if you are happy with 3.73s stock, I think you'll be happy with 4.56s. If you decide on 4.88s, it won't be too low of a gear for your setup and usage. Remember the 3.6/WA580 combo can generally be geared one step taller than the 3.8/42RLE combo.

The issue with limp mode is that '12s have an additional module that needs to be changed when you calibrate the gear ratio. The older programmers only calibrated one, so when the '12s came out and you tried to program a new ratio, only one module was changed, creating conflict between the two modules. This is why limp mode happened (the vehicle thinks there are two different ratios installed). AEV has addressed the issue in the current tune and the ProCal is 100-percent compatible with the '12.

The JK braking system has enough braking that you shouldn't have an issue with stopping in low range with 35s and 4.88s, even on the 4:1 case. However, Teraflex has a great Big Brake Kit if you feel the need to get some braking back.

--Sean
Sean is yours an auto?

Yeah, I am not sure if 4.56 or 4.88. Knowing that I rock crawl and highway drive daily at 80mph and tow, I want to find the sweet spot.
02-28-2012 11:11 PM
ESP Your front axle or deferential does determine how far you can go with gears. Since the OP is running a D44 for both he is not limited to 5.13 with his front like a sport or sahara with the D30.

Here is a gear ratio chart you can pick from and a link to another thread you should read. http://www.wranglerforum.com/f33/gea...on-130244.html

02-28-2012 10:54 PM
seanpholman Yeah, 4.56s are hard to find, but they are out there. Superior and US Gear now have them, I believe. Because the WA580 tranny has such a wide ratio spread, you can get away with 4.10s and 35s depending on use. IF you live in flat areas, drive mostly highway, and don't load your Jeep down with weight (bumpers, armor, etc.), 4.10s and 35s would be adequate. I know it sounds crazy, but the 3.6/Auto/4.10s is still geared lower overall than the 3.8/Auto/4.88s.

For your use, it sounds like you might even be a candidate for 4.88s, but if you are happy with 3.73s stock, I think you'll be happy with 4.56s. If you decide on 4.88s, it won't be too low of a gear for your setup and usage. Remember the 3.6/WA580 combo can generally be geared one step taller than the 3.8/42RLE combo.

The issue with limp mode is that '12s have an additional module that needs to be changed when you calibrate the gear ratio. The older programmers only calibrated one, so when the '12s came out and you tried to program a new ratio, only one module was changed, creating conflict between the two modules. This is why limp mode happened (the vehicle thinks there are two different ratios installed). AEV has addressed the issue in the current tune and the ProCal is 100-percent compatible with the '12.

The JK braking system has enough braking that you shouldn't have an issue with stopping in low range with 35s and 4.88s, even on the 4:1 case. However, Teraflex has a great Big Brake Kit if you feel the need to get some braking back.

--Sean
02-28-2012 10:33 PM
Smyln
Quote:
Originally Posted by seanpholman View Post
Having a Dana 44 diff has nothing to do with the gear ratio you want. Not sure what ESP is saying here???

4.88s are absolutely appropriate for a 2012 with an auto and 35s (Not so much for a '07-'11). I'd even argue that 4.56s are a good choice if you do more street driving and want better fuel economy.

All you need is the stuff for the gear swap and an AEV ProCal to calibrate your computer.

--Sean
Sean I was thinking that 4.56 is the sweet spot but I didn't think it was possible to get 4.56 gears.

I do highway driving about 80mph, towing a trailer with 2 snowmobiles, and live in the mountains of pennsylvania, plus I rock crawl.

So AEV proCal is what I need to prevent limp mode?

I definitely know I don't want to go any higher than 4.88. Just wondering if with the 2012 auto and 4.88 if that would be to low of a gear.

Wondering if when crawling in 4.1 if I will have a problem with stopping.
02-28-2012 10:02 PM
seanpholman
Quote:
Originally Posted by ESP View Post
Nothing. Changing the gears will not make your jeep go into limp mode. You do not want 4.88s with an auto tranny though you should be looking at 5.13s or even 5.38s since you have a D44 front and rear.
Having a Dana 44 diff has nothing to do with the gear ratio you want. Not sure what ESP is saying here???

4.88s are absolutely appropriate for a 2012 with an auto and 35s (Not so much for a '07-'11). I'd even argue that 4.56s are a good choice if you do more street driving and want better fuel economy.

All you need is the stuff for the gear swap and an AEV ProCal to calibrate your computer.

--Sean
02-28-2012 09:55 PM
ESP Nothing. Changing the gears will not make your jeep go into limp mode. You do not want 4.88s with an auto tranny though you should be looking at 5.13s or even 5.38s since you have a D44 front and rear.
02-28-2012 09:50 PM
Smyln
2012 JKUR Auto what's needed to regear

I have a 2012 JK Unlimited Rubicon Auto with 3.73 gears.

What do I need to prevent my vehicle from going into limp mode with 4.88 gears?

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