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Old 03-18-2010, 07:54 AM   #1
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Vibration at 45-50 mph

I have a 2010 JK Sport Auto, At 45 -50 mph there is a vibration you can feel through the pedals and seat. it goes away if you turn off the overdrive. It only has 1100 miles and no other probs. Anybody have this issue?
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Old 03-18-2010, 08:35 AM   #2
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I just noticed my auto JK doing this on the way to work. It's a slight vibration, with a low growl. Seems to only do it when I'm coasting 40-55mph. It MIGHT be doing it right before my OD shift though, but I'm not sure yet. Almost not noticeable. I haven't played with my tranny yet to see if that's what's doing it. My initial thinking was it was tire wear/unbalance, or just road noise.

Can't be my driveshaft...I'm not lifted yet.

Tires are a good candidate.

If it's the tranny I'm not sure what I'll do yet.

When I get out of work, I'm going to cruise around and see if it's the same thing you're experiencing with the OD.

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Old 03-18-2010, 08:39 AM   #3
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Mine is all stock, I have switched the Overdrive off and on while experiencing the vibration. it goes away when overdrive is off.
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Old 03-18-2010, 09:04 AM   #4
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Hm...solenoid...maybe but I doubt it.

You know, now that I think about it, maybe it's just that OD locking up. Are the RPM's sticking even when you give it a little more throttle right before the OD shift? It should creep 100-200, then drop a bit once OD shifts and settles. Like I said I haven't played with mine yet, but if it it jumps to like 2000 or so from I don't know...1400, it's got to be the tranny program. The computer might need flashed. I can't come up with anything better than that

if I'm correct, warranty will cover it. This MIGHT be normal transmission behavior for our JK's though, if not, I think a computer flash will be the fix.
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Old 03-18-2010, 09:08 AM   #5
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Just made an appointment with the dealer for tomorrow morning. I'll let you know what happens.
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Old 03-18-2010, 09:50 AM   #6
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Cool. I'll report back this evening with what mine is actually doing. I'm not too worried about, but it is slightly annoying
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Old 03-18-2010, 03:12 PM   #7
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Ok. Played around a little. Mine does it right before OD, and slightly during, more pronounced during coasting.

I'm going to say we have torque converter shutter

nothing to worry about, but I know of 2 fixes. Shut down OD, or turn up the radio lol!

Your dealer can flash your computer or replace the TC, but more than likely it comes back. They'll say it's "normal" probably

Rule this up as "one of those weird noises/things Jeeps do"
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Old 03-18-2010, 03:18 PM   #8
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which is probably why I always turn off O/D when I know I'll be hitting the highways
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Old 03-18-2010, 03:31 PM   #9
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Old 03-22-2010, 02:55 PM   #10
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Well another wasted trip to the dealership!! Went by on friday they said there was nothing wrong. The girl in the service dept, said to drive a while so the tires would soften up!!! WHAT the H---. I got the service MGR to go for a ride with me and he felt the same thing I was complaining about. He wanted to keep it all day today, they say it checks out fine. I guess I'll just hit the o/ d button each time I get in.
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Old 03-22-2010, 03:23 PM   #11
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I have an appointment set up for Wednesday. I'm curious to see how it goes. My Jeep is at the point to where it does it in all 3 gears, speed doesn't matter but it's more noticeable the faster I go. It always occurs between 1600 and 1900rpm's now.

This is why I just looooooove computers in vehicles.

Tires soften up? Oh so the compound material, and load ratings change as you drive?

I'd go back there with a print out of the NUMEROUS TSB reports on the 07's. I've got an iPhone, so if they give me static I'll pull up the 5 or so bulletins on this lousy transmission.

I should have got a 6-speed. Maybe I'll sell this Jeep and get a 2010 6-speed Rubicon.

I'll let you know Wednesday what kind of bullsh*t they try to pull. I've only been in there once. I bought parts and got a buildsheet. My dealership seems ok, but this will be the real test. If they suck, I'll just swing by one of the other 5 stealerships in the area
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Old 03-22-2010, 03:52 PM   #12
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my jeep does the same thing, I figured mine was due to the front driveshaft cause I have 4" of lift, I'll try the od off next time I drive it.
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Old 03-22-2010, 04:05 PM   #13
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With 4" of lift I wouldn't rule the driveshaft out. It's more RPM related though. With time, in my case 1 week, the vibration has spread into all 4 gears and is hidden between 1600 and 1900 rpm's. We just noticed it more in overdrive due to the speed.

Click that TSB link I posted above. Apparently some people get hard shifting as well. My JK has always shifted weird. I'll be in 3rd sometimes at only 20mph lol
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Old 03-22-2010, 05:38 PM   #14
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Yeah I hope its more of drive shaft issue than my torque converter. My transmission shifts hard to but so has every automatic jeep I have rode in. I have tuned my jeep with the superchips flashpaq but I didnt mess withe transmission shift points feature it has.
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Old 03-22-2010, 06:54 PM   #15
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Even after a flash, and/or a converter replacement, it always comes back. All Chrysler vehicles with this transmission do this. Hm...you'd think they would redesign it.

You've got a flashpaq. You might be able to correct that yourself by altering the shift patterns. Big problem with me though is 4th likes to settle in at about 1800rpm, in range of that damn vibration. I've never played with a flashpaq, but I'd imagine you could get 4th to settle at say 2500rpm and fix that problem.

Im going to get one, but i'm trying to avoid a regear. I was hoping those shift patterns would bail me out lol!
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Old 03-22-2010, 07:40 PM   #16
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Going into overdrive creates an output shaft rpm which is higher than the engine rpm..(.069:1) In one of the planetary systems the ouput shaft speed needs to be increased.. This means that some gears will be spinning faster ..Imperfect gear profiles meshing patterns (a result of bad tolerances stack-up and /or gear distortion) will create this noise...
Definitely not a Quality product..
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Old 03-23-2010, 09:06 AM   #17
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I hate to say it but, hearing all crap the guys at work gave me for being a
" Soccer Mom" for driving the Minivan the dealership gave as a loaner. I'm very Happy to have my Jeep back
I'll just deal with the Vibration!! LOL
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Old 03-23-2010, 11:24 AM   #18
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Might just be a tire out of balance.
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Old 03-23-2010, 11:42 AM   #19
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Check the torque on the lugs. @100ftlbs. I believe is correct.
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Old 03-23-2010, 12:08 PM   #20
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It's no tire. I'm positive it's the slushbox. Tires out of balance don't balance themselves during a shift, then go unbalanced again. You can alter this vibration by shifting to 2 or 1. It changes pitch. OD has an affect on it too, as well as throttle and RPM's.

The question is, what needs done with it if the dealer denies service?

I'm going to flash it myself I think, and maybe swap out converters lol!
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Old 03-23-2010, 12:19 PM   #21
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Tire was a stab; usually driveline if you feel it mostly in your butt.
How about a driveshaft balance issue? I had Crown Vics do that to me.
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Old 03-23-2010, 01:03 PM   #22
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There's a possibility of it being a shaft or gears, but I'm running stock 32's with no lift yet. I'm having trouble convincing myself it's driveline related. The vibration isn't speed related like we originally thought. It's all RPM, OD, and shift sensative.

It has to be the PCM. It was good one day, gone the next.
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Old 03-23-2010, 01:50 PM   #23
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Quote:
Originally Posted by GroceryGrabber View Post
There's a possibility of it being a shaft or gears, but I'm running stock 32's with no lift yet. I'm having trouble convincing myself it's driveline related. The vibration isn't speed related like we originally thought. It's all RPM, OD, and shift sensative.

It has to be the PCM. It was good one day, gone the next.
USAntigoon will have to solve this one in his CAD-brain.
C'mon Goon, you can do it.
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Old 03-23-2010, 02:36 PM   #24
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Here's another clue. I was driving home from work. Took it up to 65 with no OD. My exit ramp was coming up, so I popped it in no gear.my RPM's were just under 3,000 so I began braking to negotiate the curve and stop at the sign. I watched the RPM's drop and the Jeep growled at 2200 down to about 1500, then quiet as a mouse just like at 3000.

I also did this...I live on top of a hill. Tranny was in drive. I stopped at the base and accelerated up the hill. I kept it at about 15mph, my rpm's were about 1900. In first gear at low speed, I was able to make it start, and sustain the noise as long as I kept the RPM's in that range.

I know slushboxes make noise during deceleration, and mine does too. But that just seems like alot of chatter in that RPM range.

I've been checking fluid color and smell every day too. Everything looks and smells normal. Now yesterday I was screwing around with it alot. I pulled out the stick after a 25 miles stop and go/highway ride and the metal ALMOST made me jerk my hand off the stick due to heat. I don't know what normal running temp is for this slushbox, but I have NEVER felt a dipstick that hot before. I touch all tranny sticks barehanded too so I can wipe some fluid on my finger for inspection, unlike motor oil. I use a rag for that.

It was hot, but looked perfect and smelled like slush.
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Old 03-23-2010, 05:51 PM   #25
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This needs a step by step analysis of the issue.. So it seems to be more then just NOT using the O/D.. It seems to be engine rpm related....and high temps..
First step..Let the dealer do a transmission diagnostic check..
Ask him to check for transmission DTC's.. if nothing is found let him do a line pressure check for all the circuits.. This will define whether the clutches operate properly..
Be sure you have the oil level correct etc..
Auto transmissions are way more complex than manual transmissions.. Much more DTC's to look at, quite a complex hydraulic circuitry.. You do need all this diagnostic equipment to do the right analysis..
The most important steps are to separate the electronics from the hydraulics.. once these two are OK one has to look into the gearing and vibration analysis..
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Old 03-23-2010, 07:40 PM   #26
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Thanks for the info goon!

When I go in tomorrow I'm keeping my mouth shut at first. All I said on the phone when I called was "I think my tranny is acting up." I want to see what they come back with.

If I get static, I'll tell them to run the DTC code check, and line pressure for the circuits. At this point, I'll also point out the 2 TSB's I've found online and show them in case they play dumb.

If I still get no service or they want to charge me (I'm currently under extended warranty) I'll probably get pissed and start yelling like I always do lol! Maybe try another dealership.

I refuse to pay for any repairs with this issue. I know for a fact it's nothing I've done, and I know it's not normal no matter what people tell me. I've wrenched around on cars and Jeeps since I was 16, auto's don't behave like this. I'll sell this Jeep before I drop a dime into this transmission.
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Old 03-23-2010, 08:07 PM   #27
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Good luck..

On a side note.. I always have a chuckle once I read "Goon" ..

My forum name is a concoction of two names, US and Antigoon.. Antigoon was a mythical giant who lived in Antwerp and who was killed by a Roman soldier called Silvius Brabo. I was born in Antwerp and liked the combination hence USAntigoon..
What's in a name..
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Old 03-23-2010, 09:40 PM   #28
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Antwerp as in Belgium? Very historically famous port...as it was the goal of Hitler's final assault known as the Battle of Bulge. Nazi Germany hoped to blitzkrieg their way into the Allied front and capture the port of Antwerp Belgium..... It failed, never reached Antwerp....

Sorry to go off on a tangent, I digress
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Old 03-23-2010, 09:51 PM   #29
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Antwerp as in Belgium? Very historically famous port...as it was the goal of Hitler's final assault known as the Battle of Bulge. Nazi Germany hoped to blitzkrieg their way into the Allied front and capture the port of Antwerp Belgium..... It failed, never reached Antwerp....

Sorry to go off on a tangent, I digress
Indeed.. you got it all correct...You deserve a promotion!!!
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Old 03-24-2010, 07:46 AM   #30
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Antwerp as in Belgium?
I hear his accent when I read his posts; weird, isn't it?

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