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Old 05-08-2013, 11:30 AM   #1
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2013 JKU vs TJ - Deceleration question

Happy owner of a 2001 TJ here. I have the inline 6, manual. Before I go to a dealership and drive them nuts with some driving comparison, I figured I would ask here.

In my TJ, when I take my foot off the gas, it decelerates almost like I am putting on the brake. I'm extremely happy with this behavior. I hate driving my wife's suburban in traffic, that beast just wants to keep going. I know, weight, etc. My wife has hinted that I should get an auto for two reasons, 1) remote start and 2) she could drive it if necessary. She doesn't want to learn to drive a manual. She almost put my TJ through the wall of the garage in our old apartment, thankfully that rug that sat under the Jeep bunched up and prevented it from happening.

So, to get to my question to the 2013 JKU Rubi owners, both manual and auto, how does the JKU react when you release the gas pedal and decelerate? Does it slow down quick, or is it a gradual slow down?

I plan on ordering a 2014 when they are available. Before anyone asks why, because I can

Thanks in advance for your replies!

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Old 05-08-2013, 11:34 AM   #2
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It is probably different to everyone. I think the best way to get a good answer would be to drive some dealers nuts (hey, it is your money) and test drive a 2013 Rubi JKU with 4.10's. Gradual to one person may not be so gradual to someone else.

I've never driven a Rubi with 4.10's, but I did drive 2012 Sahara JKU's back to back, one with 3.21's and one with 3.73's. The 3.73 deaccelerated quicker than the 3.21's....but any comparison is hard to make...espeically if you are coming from a stick.

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Old 05-08-2013, 11:48 AM   #3
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2013 w/manual and 3.73 gears here. I'm not sure exactly what you're looking for regarding the strength of engine braking at various speeds, so I will generalize. In first and second gear, the engine braking is pretty strong, particularly first since its already revving pretty good at 20mph with my gearing.

Here is the thing I'm not sure if you're going to like... The Pentastar is pretty flexible and it has made me kind of lazy with downshifts. In 4th or 5th gear, you can slow way down rolling up to a stop and it won't buck or do anything crazy. I'm often pulling it out of fifth into neutral at a really low speed. I only do this when I know I'm not going to be getting back into the throttle, because its hard on the engine to put a heavy load on it below 1000rpm.

This would lead me to describe the engine braking in 3rd through 6th as pretty mild.

It has been forever since I drove a straight 6 with a manual trans, so I don't have a frame of reference for your exact circumstance.
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Old 05-08-2013, 11:51 AM   #4
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My 2013 with auto slows down pretty quickly when I take my foot off the gas - almost feels like I'm braking. To tell you the truth I'm not totally thrilled with this behavior - I think coasting would save a bit of gas. However, I suspect it's not even close to the engine braking you'd get with a manual transmission. My only comparisons are with other auto transmission vehicles (LJ, Dodge Dakota, Subaru).
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Old 05-08-2013, 12:50 PM   #5
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I have had my JK10A for a little under a week now (6 speed, 4.10 gears), and I think it slows down quite dramatically as soon as my foot comes off the gas.

I traded in my 2010 Nissan Frontier, and I could coast for a good distance in 6th gear without the gas pedal depressed. In the Jeep, as soon as the foot comes off the gas, it is obvious it is slowing down.
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Old 05-08-2013, 01:06 PM   #6
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The gearing makes all the difference. My JKUR with auto 4.10 decelerates a lot. To the point where of I time it right, I barely use brakes.

If you want that feeling, go with the 4.10. You'll pay for it on gas, but coming from a TJ, it'll probably be an improvement on gas all together.
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Old 05-08-2013, 01:14 PM   #7
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I also have a jkur with 4.10 and auto and when I let off it slows more than anything I've ever driven with an auto, though not as much as a manual. If I'm going uphill I can often just coast to a stop for a light.
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Old 05-08-2013, 02:22 PM   #8
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I have a 2010 with 35s and 3:73 gears on a manual. I was going 70mph down the highway and i let off the gas and within 5 seconds i was going 60mph ish. The engine breaking is pretty good. Its definitely different than my moms Tahoe, the engine breaking isn't as present below 35 unless its in the higher rpms, but downshifting solves that.
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Old 05-08-2013, 04:13 PM   #9
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I have a 99 and a 2012, both automatics. The 2012 engine brakes more.

From what I have seen on other threads you can buy a programmer to change how you want your new Wrangler to run.
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Old 05-08-2013, 04:19 PM   #10
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2013 4.10 auto and the engine brakes a good bit. Very happy with that "feature" as well.
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Old 05-08-2013, 04:48 PM   #11
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Thanks for the replies. I'm not concerned about gas milage, if you buy a Jeep, that should be the lease of your concerns! I think about the driving experience. My first car was an auto, the rest have been manuals. I hit 40 this year, so I'm wondering if I'm ready to make that switch. Of course, it will also come down to options I want vs cost and what the CFO is willing to fund Thanks again!
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Old 05-08-2013, 10:19 PM   #12
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Manual transmission is $1,000 less than auto. So that can be a cost savings right there.


I tried using that on my CFO and it didn't work. She said "What if....emergency...blah blah" my answer weren't good enough. She's only driven the jeep once in the past 5 months. I'm not upset, I still got the jeep I wanted and can live with the auto :-)
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Old 05-09-2013, 05:44 AM   #13
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I broke a wheel speed sensor and the engine breaking or whatever it's called disappeared.
I actually posted about it way back and was told The 6 speed doesn't "engine break"
Maybe something to do with the programming.
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Old 05-09-2013, 06:50 AM   #14
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I've never driven a Jeep with an auto trans. About a year ago, I sold my 98 TJ with a 4.0L manual and 5 weeks ago I took delivery of my new Jeep. Although my new Rubicon feels much more refined than the old TJ, the driving experience is amazingly similar. I found myself down shifting more in the TJ to make sure I was in the proper gear while the JK has the power to accelerate harder in a higher gear. Still, if I take my foot off the gas the engine braking is significant. I think the TJ had the advantage in engine braking though. Maybe because it was lighter.
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Old 05-09-2013, 07:03 AM   #15
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2012 auto Sahara with Max Towing (I think that means 4.10 gearing).

Employs significant engine breaking...usually.

Sometimes it coasts just fine.

I'm still trying to figure out what the trigger is for how it decides to engine-break or not....cuz I prefer it didn't.
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Old 05-09-2013, 07:45 AM   #16
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Disconnect a wheel speed sensor and you will see what I mean.

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