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Discussion Starter · #1 ·
I had a vibration under hard acceleration. It wasn't so bad so I just lived with it. I installed a RC 4" lift last weekend including the transfer case drop and now the vibration is worse. My driveshaft angle doesn't look bad. I am thinking of a SYE but seeing that I has the vibration before the lift it may not solve my problem. Any ideas?
 

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Your u joints are bad. they have been at a stock angle for years and now that you have raised it they are at a different angle. even with the TC drop. happened with me.
 

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I had the same thing with a 2.5 inch lift. Only solution was a SYE and double cardone drive shafts. Transfer case drop did nothing. The angle at the TC was 20 degrees but 0 at the rear. From my research, both joints on a double joint axle (ie regular driveshaft) have to match if they don't you wind up with 2 lengths with the top being longer than the bottom, so the joint nearest the TC binds at the bottom because it tries to move slower or faster (I forget what it was) than the top.
Even a TC drop doesn't solve the problem unless you are around a 1 inch lift, or 2 inch lift. From experience anything more than a 1 inch drop causes binding of the 4wd shifter. So with a 4" lift, save yourself time and money and go for the SYE and driveshaft.
 

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Driveshaft angles depend on the type of shaft. Take a look at these pics and then check your pinion angle.

Need to learn more go to Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist

Halfway down right center grey banner Technical Information and Sponsorship there is more than you want to read but you need to understand what to do to fix it. It won't be just add a lift and SYE you will also need a magnetic angle finder. Took me a little while I learned no vibes on anything I have worked on this year and that is about 8 YJ/TJs.\

Have some fun
 

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Front axel vibration

I have a different vibration issue. When I engage 4wd on my 1988 yj I get a vibration until I hit about 35 mph. I have a spring over set up with the stock springs and 35 inch tires. Any thoughts? :hide:
 

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I had the same thing with a 2.5 inch lift. Only solution was a SYE and double cardone drive shafts.
No such thing as only one solution. I would def not get a CV shaft for a 4 " lift though. Get a SS SYE and a normal driveshaft. Your angles should be good enough to do that with no problems, and normal driveshaft are much stronger.
 

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why are you going 35 in 4wd?
Just to see if it was constant at all speeds. I usually am only going about 10 mph or so. I do drive in sand and I sometimes need to get some speed on the sandy hills.
I had a bad vibration when I drove the jeep on the paved roads and got up to about 45 mph. I ended up replacing the bearings in the front axel on both ends and that got rid of that vibration. I get the feeling that I might need to rebuild the transfer case for this problem.
 

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Just to see if it was constant at all speeds. I usually am only going about 10 mph or so. I do drive in sand and I sometimes need to get some speed on the sandy hills.
I had a bad vibration when I drove the jeep on the paved roads and got up to about 45 mph. I ended up replacing the bearings in the front axel on both ends and that got rid of that vibration. I get the feeling that I might need to rebuild the transfer case for this problem.
Nah. Tc won't cause driveshaft vibrations unless the bearing in the front is completely shot. And even if it is you don't need to pull the tc to replace it
 

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What about a bent axel?
Probably a ujoint. Could be the slip in the driveshaft going bad if there is a lot of play in it. Bent shaft is less likely.
 

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vibration

I am having the same issue with my 95 and what i have found out is that there is a transmission/transfer stabilizer on mine that will not tighten. I have ordered the new one along with new transmission mount. I will post the results when i have them replaced. I also attached a picture of what the mount and stabilizer look like
 

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I am having the same issue with my 95 and what i have found out is that there is a transmission/transfer stabilizer on mine that will not tighten. I have ordered the new one along with new transmission mount. I will post the results when i have them replaced. I also attached a picture of what the mount and stabilizer look like
THIS, no one ever mentions this when diagnosing vibes under acceleration. If the torque arm bolt/bushings arent tight, are missing, are worn, it will vibrate like hell when you step on the gas and the transmission literally rotates from the torque. Also, when it rotates, it changes your driveline angle, you would never see this, because it only happens when under load. When you look at it parked, the angle looks fine. Put it in gear, step on it, the angle changes because the transmission rotates.
 

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I am having the same issue with my 95 and what i have found out is that there is a transmission/transfer stabilizer on mine that will not tighten. I have ordered the new one along with new transmission mount. I will post the results when i have them replaced. I also attached a picture of what the mount and stabilizer look like
THIS, no one ever mentions this when diagnosing vibes under acceleration. If the torque arm bolt/bushings arent tight, are missing, are worn, it will vibrate like hell when you step on the gas and the transmission literally rotates from the torque. Also, when it rotates, it changes your driveline angle, you would never see this, because it only happens when under load. When you look at it parked, the angle looks fine. Put it in gear, step on it, the angle changes because the transmission rotates.
I had vibes even with an SYE and CV driveshaft. The pinion angle and drive shaft angle were with in 2* of each other too. Put in a new transmission mount and the torque arm and the vibes went away. Sometimes the solution can be that simple!
 

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Just replaced the tranny mount and stabilizer this weekend and now no vibration rides like a different jeep......hope you all find out what is causing yours.....hope this helps
 
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