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Old 09-06-2010, 11:41 AM   #1
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Question Removing Rear Sway Bar

My rear sway bar's bushings are about to rot completely off. I have a new set of poly ones but I can't seem to get the torx bolt off the new lift's mounting bracket on the axle. Does anyone know what size it is? The main reason I'm doing this is because I still have some drive line vibration after fixing my pinion angle, replacing my lower control arm bushings and tightening my rear shocks. Will the new track bar bushings help with this vibration or am I still doing something wrong?

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Old 09-06-2010, 11:45 AM   #2
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If you still have driveline vibration after fixing your pinion angle, it sounds to me like the pinion angle wasn't dialed in properly. The antiswaybar is not the source of your vibrations.

Do you have a CV driveshaft? If so, is the rear pinion angle exactly equal to the driveshaft angle? The rear pinion angle cannot even be a single degree above that of the driveshaft's angle but it can be as low as 1-2 degrees under it.

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Old 09-06-2010, 11:52 AM   #3
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yes its a tom wood drive shaft. When I disconnected the rear upper adjustable cntrl arms i tried to make the axle go down a bit to align it better but it wouldn't move. So I figured it was as aligned as it was gonna be. I put the angle finder on and the angles on the axle end of the cv was the same as the transfer case end. Do I need to lengthen the adjustable control arms again?
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Old 09-06-2010, 12:00 PM   #4
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Originally Posted by BigSahara View Post
yes its a tom wood drive shaft. When I disconnected the rear upper adjustable cntrl arms i tried to make the axle go down a bit to align it better but it wouldn't move. So I figured it was as aligned as it was gonna be. I put the angle finder on and the angles on the axle end of the cv was the same as the transfer case end.
All of that is why you still have vibrations. You can't take the attitude "I figured it was as aligned as it was gonna be" and not expect vibrations.

The pinion angle cannot be and must not be the same as the transfer case output shaft once you go to an aftermarket CV driveshaft like you got from Tom Wood.

Your pinion angle must look like this to prevent having vibrations, do whatever it takes to get it as shown below.
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Old 09-06-2010, 12:06 PM   #5
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OK, I'll try it again. I wish there was a self aligning cv joint lol.
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Old 09-06-2010, 12:08 PM   #6
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OK, I'll try it again. I wish there was a self aligning cv joint lol.
The CV joint itself is, it's the rear end of the rear driveshaft with its single u-joint that is the problem that causes vibrations. That is where the angle needs to be pretty close to zero.
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Old 09-06-2010, 03:16 PM   #7
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OK,

So I lengthened the rear upper adj. cntrl arms 1/4'' after jacking up the rear axle under the diff. to make the rear cv measure between 14 and 14.5 degrees and the front end 15.5 degrees. Now it should be dead on. I drove around a bit at about 5- 10 mph and the vibes are back but not as bad. Is it the u-joint? It's not a constant vibe but I only hear it when I'm slowing down and then it stops. It almost sounds like it could be coming from somewhere else. I did have my gears done recently, could that be it? All the u-joints are grease-able so could extra grease help this?
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Old 04-21-2011, 07:52 AM   #8
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I'm not dealing with any of this but I am interested in knowing how you figure the angles so precisely when you do this kind of work.
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Old 04-21-2011, 10:10 AM   #9
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It's not a constant vibe but I only hear it when I'm slowing down and then it stops.
Vibes that only happen during deacceleration are commonly caused by the pinion shaft angle being a little too low. Vibes that only happen during acceleration are usually caused by the pinion shaft angle being a little too high.

You could have a bad u-joint too but check that your pinion angle isn't actually lower than it should be by a degree or two.
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Old 04-21-2011, 10:19 AM   #10
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I'm not dealing with any of this but I am interested in knowing how you figure the angles so precisely when you do this kind of work.
Once you learn how, your eye is actually very adept at spotting a pinion angle that is too high or too low. I used to use an angle finder to compare the angular difference between the pinion shaft and driveshaft but no longer need to, it's something I can eyeball now.

Until you get to that point, which doesn't take a whole lot of time especially if you are shown what good vs. bad angles look like, you can use the below type of angle finder. I measure the pinion angle from the rear of the axle on one of the two 'flats' that are on either side of the differential cover. The flats on the axle housing are exactly 90 degrees from the pinion angle so the angle finder's top surface will show you the true pinion angle read directly on the dial. That is then compared to the driveshaft angle.

Notice the first picture is measuring from the rear of the axle. The top 'flat' of the angle finder not touching anything is actually at the pinion angle. The next pic shows the angle finder measuring the driveshaft angle. You can see the top flat of the angle finder can be used to determine the difference in angles between the pinion and driveshaft.
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Old 04-21-2011, 10:22 AM   #11
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I swear you have pictures for everything Jerry
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Old 04-21-2011, 10:42 AM   #12
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I swear you have pictures for everything Jerry
Been taking pics and collecting the good ones I see for years.
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Old 04-21-2011, 12:53 PM   #13
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Originally Posted by Jerry Bransford View Post
Once you learn how, your eye is actually very adept at spotting a pinion angle that is too high or too low. I used to use an angle finder to compare the angular difference between the pinion shaft and driveshaft but no longer need to, it's something I can eyeball now.

Until you get to that point, which doesn't take a whole lot of time especially if you are shown what good vs. bad angles look like, you can use the below type of angle finder. I measure the pinion angle from the rear of the axle on one of the two 'flats' that are on either side of the differential cover. The flats on the axle housing are exactly 90 degrees from the pinion angle so the angle finder's top surface will show you the true pinion angle read directly on the dial. That is then compared to the driveshaft angle.

Notice the first picture is measuring from the rear of the axle. The top 'flat' of the angle finder not touching anything is actually at the pinion angle. The next pic shows the angle finder measuring the driveshaft angle. You can see the top flat of the angle finder can be used to determine the difference in angles between the pinion and driveshaft.
Excellent explanation, Jerry. Thank you. I especially appreciate the pictures.
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Old 11-07-2011, 03:09 PM   #14
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Vibes that only happen during deacceleration are commonly caused by the pinion shaft angle being a little too low. Vibes that only happen during acceleration are usually caused by the pinion shaft angle being a little too high. .
Glad I ran into this thread, it's like the "Everything You Need to Know About Pinion & CV Style Drive-shaft Angles" By Jerry B.

This was a huge help. Been chasing this exact vibe.
Thank You!

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