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Old 02-24-2012, 11:41 AM   #1
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Ready to adjust UCA's

I just installed the AA SYE and TW ds over the weekend and ready to adjust the UCA's to the correct angle.

Here are my questions:

1. Where should I place (measure) the analog angle finder? At the SYE CV and the ds yoke?




2. Does the rear axle need to be off the ground to adjust the angle? Adjust the passenger side UCA first or the driver?

Thank you in advance.

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Old 02-24-2012, 03:03 PM   #2
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Hmmmmm.....no one?

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Old 02-24-2012, 03:35 PM   #3
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1) See the flat round spots on either side of the diff cover? Those are perpendicular to the pinion centerline. Use either one of those for the flat edge of your angle finder. You want the pinion to be inline or a degree or two below the angle of the drive shaft. For example, if you sit that angle finder on the drive shaft and get 16*, you want the pinion to be in the 14-16* range.

2) Keep the Jeep on the ground when doing this. Place a jack under the pinion, put the transmission in neutral, and put a block behind the front tire. Unbolt both uppers and use the jack to get the pinion where it needs to be and keep it there. Adjust BOTH uppers to fit so that you can just slide the bolt through. I say this because some people adjust one, put the bolt through and then release the jack and THEN adjust the other upper and slide the bolts through. In that scenario, you've got one arm that's preloaded and the other isn't....they're seeing unequal forces. You want them equal. Once you've got both bolts through, tighten them down and release the jack.
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Old 02-24-2012, 03:41 PM   #4
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1.
You will want to measure the angle of the u-joint (axle side of DS). This is what causes vibrations. The angles in the CV (SYE side of DS) isn't important as long as the joint isn't binding.

There are 3 ways I've done it. I do all 3 just in case.

1st: Put an angle finder on the DS (blue arrow). Then put angle finder on flat area on the bottom of pumpkin (red arrow). Subtract those 2 angles and you get the angle of the u-joint. You want it to be 0-1 degrees if possible.

2nd: Turn DS until one side of the DS yoke (pink arrow) is aiming straight down to the ground. Put a socket up to it. Then put an angle finder on the socket. Now turn the DS until the pinion's yoke (green arrow) is aiming straight down to the ground. Put a socket that just fits inside it and put the angle finder on the socket. Subtract those 2 angles and you get the angle of the u-joint. You want it to be 0-1 degrees if possible. I have a feeling this is the more accurate way.

3rd: You can eyeball the angle pretty close to 0 degrees.

2.
No. However, if you jack up the rear axle to get the tires off the ground, and put the t-case in neutral, you can turn the DS with ease. This will not affect driveline angles as long as the jackstands are under the axle and not the frame.

Either UCA is fine to start with.

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Old 02-24-2012, 03:59 PM   #5
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Thank you, this will help me a lot especially with the visual arrows. I will give it a shot at it.
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