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Old 02-22-2011, 10:53 PM   #1
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Exclamation Vibration at 50 mph

Ok when I drive my jeep and hit 50 mph it starts to hum like "whom whom whom" it does this till like 55 but if i turn overdrive off it dosent to it. also i can avoid it if I race past 50. Anyone know what it is?.....

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Old 02-22-2011, 10:54 PM   #2
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also let me add this is an automatic transmition

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Old 02-23-2011, 07:41 AM   #3
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Idk, but the easiest thing to check first is the torque on the lugs. Star pattern, 100 ftlbs... If they're mistorqued then they will shimmy bad at certain speeds.
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Old 02-23-2011, 10:26 AM   #4
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Thanks i checked that they all are working good. I think I'm going to have to bring it in.
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Old 02-23-2011, 10:30 AM   #5
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I would get the tires rotated too. See if it changes.
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Old 02-23-2011, 10:31 AM   #6
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could just be the harmonic balance point
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Old 02-23-2011, 08:52 PM   #7
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ok so i just took to the local transmition shop and the guy there says that its is not pronounced enoughf when he took it on a test drive . he then put it on stand and got it up to the same mph and there was no problem. on the drive home i coasted do the grade at 50mph there was not sound or vibration
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Old 02-23-2011, 10:53 PM   #8
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Same thing happens with mine. It happens at around 40ish mph with OD turned off. I think its just because of the low rpm of the gear you are in. It's right above the previous gear so the rpms are lower than usual. Thats just my opinion, I am not sure if it is right
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Old 02-24-2011, 01:38 AM   #9
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ok well i found out that trans that we have is just geared like shit they say the only way to fix that is to gear the shit out the diff to compensate for the shift points.
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Old 02-25-2011, 12:44 AM   #10
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Yeah it isn't on the top of my to do list lol
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Old 02-25-2011, 12:54 AM   #11
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If you're feeling that rhythmic hum/vibration up through the seat of your pants, it could be that your rear pinion angle is just a tad off. Is your Jeep modded so the rear pinion angle has ever been adjusted?
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Old 02-25-2011, 05:00 AM   #12
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It took me a while to find out what year TJ you had. I have an 06 and it has been doing this since the day it rolled off the lot. The problem is that these transmissions will shift into OD at around 45. If you level out around 45-50 or start an incline, the trans does not shift down automatically and the rpms drop too low for the gear. Chrysler came up with this nifty little idea of giving you an OD Off switch rather than gearing it properly. When you feel the vibe, simply switch it off.
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Old 02-25-2011, 11:49 PM   #13
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Quote:
Originally Posted by Jerry Bransford View Post
If you're feeling that rhythmic hum/vibration up through the seat of your pants, it could be that your rear pinion angle is just a tad off. Is your Jeep modded so the rear pinion angle has ever been adjusted?
I have a zone 4" lift on the jeep I got a transfer case drop also just took it to a trans shop and they said everything looks good trans dif and drive line angels
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Old 02-25-2011, 11:51 PM   #14
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It took me a while to find out what year TJ you had. I have an 06 and it has been doing this since the day it rolled off the lot. The problem is that these transmissions will shift into OD at around 45. If you level out around 45-50 or start an incline, the trans does not shift down automatically and the rpms drop too low for the gear. Chrysler came up with this nifty little idea of giving you an OD Off switch rather than gearing it properly. When you feel the vibe, simply switch it off.
Yep been doin that it's so lame though
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Old 02-26-2011, 07:25 AM   #15
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Mine has been doing the same thing thanks for the description, I really could not put it to words. Problem is a vibration can be caused by a million different things. I just figured it was because of my new tires (31" MT/R) I actually had them rebalanced and it seemed to help but soon came back. Mine starts at about 45-50. I heard about what I think is called road force balancing and I might find a shop that does so and give it a shot. so many people start threads about vibrations and they are so hard to pinpoint because everbodys jeep is different (tires,mods,mileage,etc ) my vibe is not all that bad, I just learned to deal with it..

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Old 02-26-2011, 11:24 AM   #16
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Originally Posted by JDsDream View Post
It took me a while to find out what year TJ you had. I have an 06 and it has been doing this since the day it rolled off the lot. The problem is that these transmissions will shift into OD at around 45. If you level out around 45-50 or start an incline, the trans does not shift down automatically and the rpms drop too low for the gear. Chrysler came up with this nifty little idea of giving you an OD Off switch rather than gearing it properly. When you feel the vibe, simply switch it off.
Thats usually what I do, or I just accelerate to about 55 then it stops.

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