3.21 to 3.73 and feeling sluggish... - Jeep Wrangler Forum

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Old 03-06-2014, 06:01 PM   #1
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3.21 to 3.73 and feeling sluggish...

I had a 2013 Sport 2dr with the 6 speed manual, and 3.21 gears.

Yesterday I traded it in on a 2014 JKU with an automatic trans and 3.73 gears.

I've got about 184 miles on it since the test drive yesterday morning, and it just feels a little sluggish compared to my 2dr.

Is that sluggish feeling the difference between the gears, or just because the JKU just weighs more? I feel like the 2dr was much more responsive and faster. Of course the JKU has a much much smoother ride, but I didn't expect it to be so "bus like".

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Old 03-06-2014, 06:33 PM   #2
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2 door jk-s 3.21 auto

hi, I HAVE a 2012 jk-s , with auto 3.21, and it runs great, i did have 3.73 on my last jeep and they both feel about the same, i think the 4 door
has a very different feel. also it may take 5 to 10k miles before you get
more go out of your motor .. give it a little time..

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Old 03-06-2014, 06:34 PM   #3
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The 4 door is almost a quarter ton heavier, so I'm sure that's your problem. I have a 2 door 6 speed with 3:73 gears and even with my 305/70/16's it goes like hell.
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Old 03-06-2014, 06:44 PM   #4
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Disable the hill assist and give the ECU time to learn your driving habits.
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Old 03-06-2014, 06:45 PM   #5
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How do you disable the hill start assist??
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Old 03-06-2014, 07:15 PM   #6
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How do you disable the hill start assist??
I should have said Hill start/ decent control.... You can do it thought the dash menu if you are equipped with that equipment group otherwise there is a key on off process to do it... People swear by it making a big difference... I'm on my phone and it's a pain to search copy and post but if you do a search I'm sure you can find the answer quickly.
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Old 03-06-2014, 07:19 PM   #7
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People swear by it making a big difference...


A big difference in what? The acceleration, or just overall performance?

I've got the hill decent feature but its not active, and if I hit the button, the green light on the dash only flashes.

Can it be disabled any further than that?
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Old 03-06-2014, 07:21 PM   #8
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+1 sub'd
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Old 03-06-2014, 07:25 PM   #9
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The 4 door is almost a quarter ton heavier, so I'm sure that's your problem.
x2. The 2 door is more responsive almost regardless of how it is geared from the factory.
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Old 03-06-2014, 07:33 PM   #10
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x2. The 2 door is more responsive almost regardless of how it is geared from the factory.
Of course, but even just accelerating in a straight line from a stop it feels sluggish as compared. Almost as if its underpowered.
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Old 03-06-2014, 07:47 PM   #11
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A big difference in what? The acceleration, or just overall performance?

I've got the hill decent feature but its not active, and if I hit the button, the green light on the dash only flashes.

Can it be disabled any further than that?
The button you pushed is not the correct one. You need to either use the menu key on your steering wheel, scroll through your options on the display and under Vehicle Preferences, turn it off. Or as said before, if you do not have the upgraded EVIC display, there is a key sequence which will be described somewhere in the owners manual/disc. Not sure how to do the proper key sequence off the top of my head.
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Old 03-06-2014, 07:53 PM   #12
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The button you pushed is not the correct one. You need to either use the menu key on your steering wheel, scroll through your options on the display and under Vehicle Preferences, turn it off. Or as said before, if you do not have the upgraded EVIC display, there is a key sequence which will be described somewhere in the owners manual/disc. Not sure how to do the proper key sequence off the top of my head.
^ this
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Old 03-06-2014, 07:56 PM   #13
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So, does this somehow make acceleration and or mpg better?
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Old 03-06-2014, 08:02 PM   #14
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I got the flashcal superchip and it takes care of the issue and corrects mpg and speed. Awesome purchase
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Old 03-06-2014, 08:03 PM   #15
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I got the flashcal superchip and it takes care of the issue and corrects mpg and speed. Awesome purchase
My brother in law suggested this as well. I may look into it.
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Old 03-06-2014, 08:05 PM   #16
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I don't believe it will do anything for mpg. If I remember correctly, on autos it only engages if you are stopped on a 8% or higher grade. On a stick I think it activates at a 3% or higher grade. When activated, it holds your brakes on for about 3 sec after you release the brakes so you don't roll backwards. Not sure how this would help acceleration either. As soon as the computer sees that you are starting to accelerate it releases the brake. Pretty much a seamless operation that works well.
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Old 03-06-2014, 08:08 PM   #17
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I had a 3:21 2dr (auto) and went to a 3:73 4dr (auto). The 4dr is much heavier, and it's noticeable even with the higher gear ratio. Now that I have close to 1,000 miles on mine, I think it's loosening up a little, or I'm just getting used to it.

But yeah, weight is the culprit here. The 2dr was relatively... dare I say... nimble?
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Old 03-06-2014, 08:11 PM   #18
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Pasted from another post:

1. Start with the engine off and vehicle in PARK (automatic
transmission) or NEUTRAL with clutch out
(manual transmission) with wheels straight. Apply parking
brake on*manual*transmission*vehicle.
2. Start the engine.
3. With the engine running, the brake applied, and the
clutch out, rotate the steering wheel 180° counterclockwise
from center.
4. Press the ESC OFF switch four times within twenty
seconds.
5. Rotate the steering*wheel*360° clockwise (180° clockwise
from center).
6.*Cycle ignition switch*OFF then ON.
7. If the sequence was completed properly, the “ESC
Activation/Malfunction Indicator Light” will blink several
times to confirm HSA is off.
Steps 1-7 must be completed within 90 seconds to turn off
HSA. Repeat steps 1-7 to re-enable HSA functionality.
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Old 03-06-2014, 08:11 PM   #19
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I personally don't like it for everyday use. It's too herky jerky for me (6spd manual). Maybe it's great on the trails or while crawling but I haven't done any of that yet
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Old 03-06-2014, 08:13 PM   #20
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Pasted from another post: 1. Start with the engine off and vehicle in PARK (automatic transmission) or NEUTRAL with clutch out (manual transmission) with wheels straight. Apply parking brake on*manual*transmission*vehicle. 2. Start the engine. 3. With the engine running, the brake applied, and the clutch out, rotate the steering wheel 180° counterclockwise from center. 4. Press the ESC OFF switch four times within twenty seconds. 5. Rotate the steering*wheel*360° clockwise (180° clockwise from center). 6.*Cycle ignition switch*OFF then ON. 7. If the sequence was completed properly, the “ESC Activation/Malfunction Indicator Light” will blink several times to confirm HSA is off. Steps 1-7 must be completed within 90 seconds to turn off HSA. Repeat steps 1-7 to re-enable HSA functionality.
Sounds like a Nintendo cheat code for the Legend of Zelda
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Old 03-06-2014, 08:27 PM   #21
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Another thing I am going to look into. I had a Dodge Challenger for a while and many on the forums complained of some of the same acceleration and shifting problems. On the Challengers people would pull the TCM fuse in the TIPM for 30 seconds. This would clear the learning curve in the TCM and allow you to reteach your transmission shift points. The Diablo Trinity I had for it even had a selection to do this through the tuner so you wouldn't have to pull the fuse. I'm hoping we can do this to the Wranglers to. If for any reason your forced to drive (I'll call it granny mode) for multiple key cycles, the TCM thinks this is the way you normally drive and softens up the shifting. This normally happens around this time of the year when the weather is bad and everyone tends to drive a lot more cautiously and slower. Just my $0.02, but I'm going to look into this. It made a huge difference on the Challengers. The second part is the throttle response. On other Chrysler products you can reteach the throttle position sensor by turning the key to on, not start, cycle the gas pedal 3x within 10 sec and then back to off on the key. I'm also going to look into this one.
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Old 03-06-2014, 08:27 PM   #22
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Up, up, down, down, left, right, left, right, b, a, start.
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Old 03-06-2014, 08:33 PM   #23
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Up, up, down, down, left, right, left, right, b, a, start.
Weird. Now my EVIC displays unlimited lives.
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Old 03-07-2014, 05:00 AM   #24
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There was a thread about the Pentastars "coming to life" at around 4,000-5,000 miles... Not sure if they just take a long time break in, or what. Some were even speculating that power was reduced before that time. That part seemed sketchy to me, but plenty of people commented on it.

I immediately wondered if you were experiencing this after driving a broken-in Jeep.
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Old 03-07-2014, 08:28 AM   #25
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I had a 2012 2dr with the 6-speed. 3.21 gearset. Now Im in a 2013 JKU with 3.73 auto, the 2dr was FAST with that 6-speed. The JKU can best be described as "stately". Im good with that. I needed the JKU to tow my boat. Do they even sell a JKU with a 6-speed and the 3.73? That might be a more enlivened combination...
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Old 03-07-2014, 08:55 AM   #26
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I have 3.73 gears (max tow pkg) in a 14 JKU with a 6sp. Obviously it was still a factory order but I was opting for the half doors anyway. The stock JKU was very lively with the 3.73 but it's a lot more tame with 35's, 2.5in lift, rock rails, etc.
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Old 03-07-2014, 08:58 AM   #27
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I'm driving around on the 16" steelies right now... they install the Rubicon wheels/tires next Wednesday.
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Old 03-07-2014, 09:11 AM   #28
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I'm driving around on the 16" steelies right now... they install the Rubicon wheels/tires next Wednesday.
Its going to get a lot more sluggish after those go on.
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Old 03-07-2014, 09:21 AM   #29
yeah,,,, im that good

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Its going to get a lot more sluggish after those go on.
Yup....
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Old 03-07-2014, 09:31 AM   #30
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Its going to get a lot more sluggish after those go on.
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Yup....

Oh. Yay.

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