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Old 09-23-2019, 01:55 PM
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Another vibrations thread

Ok, I have read and read on here about vibrations from my lift. I have done everything I can do that I have read so far. The Jeep is lifted 4inches, sye installed with a CV driveshaft. All new parts. I have adjusted and adjusted and adjusted the rear control arms a 100 times, I think I have tried just about every length I can for all 4 rear arms. I'm at a loss at this point. 1st and 2nd gear are pretty smooth, at least it's in my tolerances of what I think smooth is, I mean it's a jeep. Once I shift into third gear and get into the 30-40mph range I get an excessive vibration. I don't even think vibration is the correct word for it. It's like a shuddering that shakes the whole dash. After I lifted and adjusted everything I figured my old 31" tires were just out of balance, but just put on new 33's and exact same shaking. My angles for the driveshaft are just about equal, 20 degrees for drive shaft and between 19-20 for pinion. I read the the pinion should be 0.5 to 1 degree lower because it shifts upward a bit when driving. I even removed the front driveshaft and drove it around, nothing changed, same shaking in the same way. It shakes my phone off the dash tray at the top of the dash. Then it smooths out again as I get more speed I don't know guys. Any help would be great, a shot in the dark or beat guesses are welcome

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Old 09-23-2019, 03:49 PM   #2
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Not to sound like a DumbA$$ but did you look at your tranny mount...beyond that I'd keep playing with the angles

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Old 09-23-2019, 04:43 PM
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I did, when I stopped the skid to do the sye install I have it a visual inspection. I know they have a tendency to separate. If the tranny mount is in one piece it's still good, right? It looked good and was solid.
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Old 09-23-2019, 05:36 PM   #4
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Have you driven with the rear driveshaft removed? Your rear shaft could be poorly balanced or have a bad ujoint.
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Old 09-23-2019, 06:28 PM
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Is it possible to be bad when it's practically brand new? Only about 500 miles on it.
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Old 09-23-2019, 06:31 PM
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Is there a visual cue that tells me if it's bad or not?
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Old 09-24-2019, 10:02 PM   #7
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Pinion angle is way off according to that pic.

The yoke coming out of the sye needs to match the angle of the yoke on the diff. Basically, you want the angle of the bottom of the driveshaft on the sye to match the angle of the top of the driveshaft on the pinion yoke. The angles need to cancel each other out.

To compensate for the diff turning upward during acceleration, set the diff pinion 1-2° lower than the sye angle. If the angle of the yoke on the sye is at 6°, set the yoke on the pinion to around 4-5°. Measurement should be taken on the cap of the yokes on the sye and pinion, not the caps of the driveshaft.

You need to shorten the upper arms to drop the pinion lower. If there's not enough adjustment in the upper arms, lengthen the lowers to gain more upper adjustment.
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Old 09-25-2019, 01:51 AM   #8
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My SYE is a hack and tap, but What your describing is exactly what mine did. I changed pinion angles numerous times and it never helped. This picture shows what my problem ended up being. I had to re tap it and tighten the bolt down and the vibrations went away. I realize your SYE is different but I would pull the drive shaft and just see if there's any parts that might be loose and tighten them. And FYI mine had a very minimal amount of play but it was still enough to cause a hellacious vibrations between 30 and 40 mph.

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Old 09-25-2019, 01:56 AM   #9
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sorry, forgot the pic

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Old 09-26-2019, 12:53 AM
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I thought the pinion angle and the driveshaft angle were supposed to be the same? With the pinion angle being maybe 1 degree less. How in my pinion angle off if the driveshaft is 20degrees and the pinion is like 19.5degrees. I'll take my rear shaft off and see if anything is loose in there, I impacted the crap out of.that yoke nut though, i can't imagine it being loose.
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Old 09-26-2019, 10:42 AM   #11
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Yes, it is possible to have a bad driveshaft even though its new. The balance could be off. Pinion angle looks fine. With an SYE you want the pinion and driveshaft to be in line with each other. Your driveshaft though is way to long. Just sitting there you are already nearly fully compressed.
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Old 09-26-2019, 10:58 AM   #12
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Aren't speed related vibrations caused by a tire balance issue. When I did my SYE/DC drive shaft, and the angles weren't correct I knew right when I started to go. I would think the vibes would start from the beginning if the pinion angle was off....
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Old 09-26-2019, 05:24 PM
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If my tires were out of balance would it only be from high 20s mph to high 30s mph? Wouldn't they always be causing vibrations at any speed? I've been wondering to myself if my driveshaft was too long, a local 4wheel parts told me that's the driveshaft I need. It didn't feel right to me from the start, a driveshaft shop could shorten it up a bit and balance it, right? Or do I need a whole new shaft?
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Old 10-01-2019, 01:26 AM
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I've had it, I'm dropping her off at a drive train specialty shop in the morning. Pretty sure the driveshaft needs to be shortened and balanced and lubed because it's making this weird squeak now. I just need to be done with this vibration issue so I'm gonna let the pros do it. It will be the first time someone other than me has turned a wrench in her since I got her. We had a good run Sandy.
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Old 10-02-2019, 03:04 PM   #15
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worth a read from the other forum
jeepforum.com/forum/f9/diagnosing-death-wobble-fixing-non-dw-shimmies-wobbles-tj-version-2359089/
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Old 10-16-2019, 10:10 AM
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Ok, so this has been on hold for a few because I had a misfire issue sending my Jeep into a barely running limp mode. Replaced plugs and coil packs and everything seems to be in order. So, this morning I removed the rear driveshaft and drove to the gas station and back in front wheel drive and the shudder/vibration between 30-40 mph is gone. So, that eliminates the front drive shaft and possibly imbalanced tires as culprits, correct? And if my pinion angle and driveshaft angle are the same, roughly 20degrees, then it has to be an out of balance driveshaft or possible bad u-joints in the driveshaft, right? So getting a new rear shaft should solve the issues?
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Old 10-19-2019, 08:29 AM   #17
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Quote:
Originally Posted by FCStevensV View Post
Ok, so this has been on hold for a few because I had a misfire issue sending my Jeep into a barely running limp mode. Replaced plugs and coil packs and everything seems to be in order. So, this morning I removed the rear driveshaft and drove to the gas station and back in front wheel drive and the shudder/vibration between 30-40 mph is gone. So, that eliminates the front drive shaft and possibly imbalanced tires as culprits, correct? And if my pinion angle and driveshaft angle are the same, roughly 20degrees, then it has to be an out of balance driveshaft or possible bad u-joints in the driveshaft, right? So getting a new rear shaft should solve the issues?
Before buying a new driveshaft, can you get your existing one balanced or have you done that already?

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Old 10-20-2019, 12:27 AM
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It's not only out of balance it's also way to long, it's fully compressed length is 16" and it's only a little more than that yoke to yoke. Local drive shaft shop wanted nearly $200 to shorten and balance the driveshaft, and with a coupon code I got an Adams driveshaft (the extreme duty with the solid u-joints) for $255 shipped. And then I busted a u-joint cap off the old driveshaft trying to wedge it back on, difficult because it's too long and lost some scattered needle bearings I just said, what the hell, Adams driveshaft it is. Will be here on Thursday.
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Old 10-21-2019, 12:52 AM   #19
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LOL. Yep..sometimes ya just gotta accept your fate and bite the bullet. At least you know your getting a very good drive shaft.

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Old 10-22-2019, 12:42 PM
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Awesome news, driveshaft came 2 days early, Adams driveshaft is fantastic. Installed and vibrations gone, weird sounds gone, everything is right in the world.
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