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Old 07-11-2010, 09:22 AM   #1
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Vibration!!!

I have a 2005 TJ which I lifted with a rough country 4" lift. I bought the SYE kit and a Tom Woods driveshaft to avoid having to lower my transfer case. I had major vibrations so I ended up installing the drop brackets to lower the transfer case. I still have a small vibration though? Has anyone had any luck not lowering their transfer case? I would really like to put my transfer case back to where it was. It doesn't make much sense to me to put a 4" lift to lower your transfer case 1". Any help would be awesome. Thanks in advance.

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Old 07-11-2010, 09:54 AM   #2
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Did you raise your rear axle's pinion angle to match the requirement of your new Tom Wood (not Woods) CV driveshaft? An improper rear pinion angle, especially if you didn't change it when you installed the CV driveshaft, can cause major drivetrain vibrations.

And you cannot simply live with the vibrations, they will start taking out things like seals, bearings, u-joints, etc.

Once you get the rear pinion angle set properly, the vibes will be gone. You do not need a t-case drop with everything set up correctly.

This is how your rear pinion angle should look... and the rear pinion angle is pretty critical. It cannot be even a single degree too high, but it can be as much as 2-3 degrees a little low. Roughly stated, the rear pinion angle needs to be at the same angle the new rear CV driveshaft is.
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Old 07-11-2010, 10:11 AM   #3
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No I did not change the pinion angle at all. I guess I was misinformed about that. I was told that if I got the SYE kit and driveshaft that I did not need to adjust the pinion angle. How do I go about changing the pinion angle? How do I know what angle it has to be? Should I get adjustable control arms do fix this problem?
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Old 07-11-2010, 10:31 AM   #4
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Quote:
Originally Posted by jeepyj84 View Post
No I did not change the pinion angle at all. I guess I was misinformed about that. I was told that if I got the SYE kit and driveshaft that I did not need to adjust the pinion angle. How do I go about changing the pinion angle? How do I know what angle it has to be? Should I get adjustable control arms do fix this problem?
Whoever told you that the pinion angle did not need to be changed once a CV driveshaft is installed was completely wrong. What the angle needs to be at was already explained above, and the only reliable way to adjust it is with adjustable length control arms. To save a little $$$, you can just get upper adjustable length control arms to raise the pinion angle. Don't go with just lower adjustable length control arms which will further shorten your already shortened wheelbase.
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Old 07-11-2010, 11:10 AM   #5
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Thanks for the help Jerry. I'm just a little confused still though on the angle. So your saying I need to find the angle of the driveshaft and then put the rear axle at that angle right? It looks like I will be buying upper adjustable control arms then. Thanks again for your help.
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Old 07-11-2010, 02:18 PM   #6
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Look at the illustration, just get the pinion shaft angle the same as the driveshaft. You can even eyeball it, it's not hard to tell when the two angles are the same.

Or if you want to buy an angle finder, get one like the one shown below. You can measure the pinion angle as shown, the angle finder in the left-hand photo is resting on the round circular surface to the side of the differential cover on the rear side of the axle. The rear measuring point is exactly perpendicular to the pinion angle so it serves as a great point from which to determine the pinion angle.

In spite of all this angle finder information, an angle finder is really not needed for this since you can generally tell by eyeball if the pinion is pointing straight in line with the driveshaft.
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Old 07-11-2010, 02:54 PM   #7
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I had a brain fart when I set up my Tom wood/SYE for my 4.5"RE superflex.All you need to be looking at is the angle relation between the two red arrows in the pic.As Jerry stated,they need to be equal or the rear pinion pointing a deg lower.I was for some reason,also looking at the cv joint relation to the transfer case putput.No need....
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Old 07-11-2010, 06:43 PM   #8
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Ok I got it now. Thanks for the advice. It was very helpful.

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