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Old 06-15-2014, 04:58 PM   #1
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Jeep shakes in 1st and reverse

So i've done pretty much everything i can think of besides tearing the gears out. My jeep shakes pretty bad under initial load in 1st gear and reverse. i changed those crappy thin threaded washers in my rough country control arms, i thought changing my rear drive shaft had to be it. it was twisting inside itself and had at least a half inch side to side play. the shaking has gotten less severe since i changed the driveshaft and it seems to happen after i've driven it across town a time or 2. transmission mounts are good, as well as engine mounts from just eyeballing them while the engine is revved. the control arm mounts are a little beat up from them banging on the sway bar. i have some longer end links, just havent changed them yet. the rear coils do bang on the track bar when i wheel, and they are sagging backwards a bit. changing those end links is my last idea. any new suggestions will be much appreciated

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Old 06-15-2014, 05:11 PM   #2
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Year, model, transmission, miles, original owner? Need some info.

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Old 06-15-2014, 05:21 PM   #3
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2010 wrangler sport, 3.8, OE transmission. Mods are on my profile. right under 50,000 miles
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Old 06-15-2014, 06:10 PM   #4
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OE doesn't help. Manual or automatic?

My first reaction is you don't know how to drive a stick and you're lugging the engine when first starting your momentum from a stop. Rev if higher before you let the clutch out.
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Old 06-15-2014, 07:21 PM   #5
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manual tranny. lol do you guys just prowl around on here to talk junk. i appreciate the driving a stick lesson dude, even though thats all i've ever driven, i'm sure i can still use some pointers once and a while. thats not what it is.
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Old 06-15-2014, 07:46 PM   #6
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If its geared high (ie 3:21s) it could be lugging a little. I've driven sticks for over 51 years including about every trans available in semi's including twin transmissions and catch myself not giving it enough rpm with 4:10s and 35" tires occasionally.

Another possibility is some grease or oil on your clutch disc. About all I can think of.
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Old 06-15-2014, 08:51 PM   #7
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My sons does it to I'm keeping an eye on your thread waiting for the right answer. Wish I had one for ya.
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Old 06-15-2014, 11:29 PM   #8
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It could be clutch chatter. That can happen if it isn't properly geared for big wheels and tires. That's what it sounds like to me. It can happen even to the best stick drivers. The clutch can also be glazed or have some oil on it.
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Old 06-19-2014, 10:48 PM   #9
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I have 4:88 gears front and back with 35" tires. that's right on the money for a 3.8. the clutch is less than 6 months old. i wouldn't think its glazed. i was really gentle on it after i installed it. it's not just a subtle shimmy like clutch chatter or oil. something in the rear end is physically shaking. i'm going to break down and take it to the offroad shop. i don't have the time to keep swapping parts, even though so far they've been necessary swaps. those guys are better at figuring these things out anyways. i'll keep you posted creepin. thanks for the input demar and matches
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Old 06-19-2014, 10:57 PM   #10
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I have a very similar problem on my 2008 2 door that's just about stock. I've been trying to figure it out for a year. It's not so severe I can pin point where it's coming from.

While letting out the clutch and lower rpm jeep vibrates. Usually only does it after it's been driven a bit. Very very annoying. It started after fist wheeling trip that was 6 hours. Jeep had 17k miles. Now has 43k. It's never gotten worse.

Please keep us posted!
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Old 06-20-2014, 07:50 AM   #11
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Quote:
Originally Posted by electrichead2001 View Post
I have 4:88 gears front and back with 35" tires. that's right on the money for a 3.8. the clutch is less than 6 months old. i wouldn't think its glazed. i was really gentle on it after i installed it. it's not just a subtle shimmy like clutch chatter or oil. something in the rear end is physically shaking. i'm going to break down and take it to the offroad shop. i don't have the time to keep swapping parts, even though so far they've been necessary swaps. those guys are better at figuring these things out anyways. i'll keep you posted creepin. thanks for the input demar and matches
If you lead with this kind of information you would have gotten better answers right off the bat.
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Old 06-21-2014, 06:09 AM   #12
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Originally Posted by electrichead2001 View Post
I have 4:88 gears front and back with 35" tires. that's right on the money for a 3.8. the clutch is less than 6 months old. i wouldn't think its glazed. i was really gentle on it after i installed it. it's not just a subtle shimmy like clutch chatter or oil. something in the rear end is physically shaking. i'm going to break down and take it to the offroad shop. i don't have the time to keep swapping parts, even though so far they've been necessary swaps. those guys are better at figuring these things out anyways. i'll keep you posted creepin. thanks for the input demar and matches
Hey no problem. Let us know what happened. Just out of curiosity, did you check the weights on the driveshaft? Maybe you're missing a weight, did you mark it and re-install it exactly the same way it was when you put it back in? Those are two things you can check that won't cost you anything..............Knowing this additional info maybe something in the rear is bad. Please let us know what the shop finds.
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Old 06-21-2014, 09:47 AM   #13
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Check the clutch slave cylinder. Mine was leaking fluid causing shudder in 1st and reverse. If u see fluid around the cylinder replace it. Mine had fluid around the cylinder and holes in the bell housing.
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Old 06-21-2014, 10:09 AM   #14
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Same issue with my old manual 2010 but with 3.21s and 35s only I drove her hard and wheeled that jeep so little things like this were kinda par for the course. Yours doesn't sound like you got to this point the same way unless the wheeling your jeep part was left out?
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Old 06-21-2014, 07:48 PM   #15
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Quote:
Originally Posted by electrichead2001 View Post
I have 4:88 gears front and back with 35" tires. that's right on the money for a 3.8. the clutch is less than 6 months old. i wouldn't think its glazed. i was really gentle on it after i installed it. it's not just a subtle shimmy like clutch chatter or oil. something in the rear end is physically shaking. i'm going to break down and take it to the offroad shop. i don't have the time to keep swapping parts, even though so far they've been necessary swaps. those guys are better at figuring these things out anyways. i'll keep you posted creepin. thanks for the input demar and matches
thx man I would appreciate that. Good luck with it
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Old 07-24-2014, 03:15 PM   #16
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Any updates?
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Old 07-30-2014, 01:58 PM   #17
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Same issue I flip the flywheel and now it is fixed. If you look at yoiur flywheel and see hot spots (blue colored marks) then flip it over and it will fix the issue.
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Old 08-01-2014, 08:45 PM   #18
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Same issue I flip the flywheel and now it is fixed. If you look at yoiur flywheel and see hot spots (blue colored marks) then flip it over and it will fix the issue.
What would have caused that? Weird

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