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Old 05-21-2012, 01:23 AM   #1
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Do I need to change axle alignment if I install a SYE?

If installing a SYE on a 3.5" lifted jeep which previously had a t-case drop, do I need to adjust the axle camber ratio/shims?

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Old 05-21-2012, 07:26 AM   #2
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here ya go...

TJ SYE Installation

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Old 05-21-2012, 07:36 AM   #3
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Originally Posted by johndoe123123 View Post
If installing a SYE on a 3.5" lifted jeep which previously had a t-case drop, do I need to adjust the axle camber ratio/shims?
yes.
read this:
What is a CV shaft and why do I want one? - JeepForum.com
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Old 05-21-2012, 08:46 AM   #4
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Like I posted on another thread the real answer is "maybe". I have learned every jeep is different. Mine did not require adjustment, is smooth as butter, and the pinion angle is pretty darn good.
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Old 05-21-2012, 09:24 AM   #5
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Like I posted on another thread the real answer is "maybe". I have learned every jeep is different. Mine did not require adjustment, is smooth as butter, and the pinion angle is pretty darn good.
There must be more to this if you didn't need to change your pinion angle. The correct pinion angle is radically different between what is required for the OE driveshaft vs. an aftermarket CV driveshaft. The wrong pinion angle will cause drivetrain vibrations.

When converting from the OE driveshaft to a CV driveshaft, the rear axle's pinion angle must be raised so it is at the same angle the driveshaft is.
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Old 05-21-2012, 09:46 AM   #6
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Originally Posted by Jerry Bransford View Post
There must be more to this if you didn't need to change your pinion angle. The correct pinion angle is radically different between what is required for the OE driveshaft vs. an aftermarket CV driveshaft. The wrong pinion angle will cause drivetrain vibrations.

When converting from the OE driveshaft to a CV driveshaft, the rear axle's pinion angle must be raised so it is at the same angle the driveshaft is.
Agreed. "Not every Jeep is the same" works for some things, but not this. Tom Wood has a good page on pinion angles:

Tom Wood's Custom Drive Shafts - Driveline 101
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Old 05-21-2012, 02:19 PM   #7
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Originally Posted by Jerry Bransford View Post
There must be more to this if you didn't need to change your pinion angle. The correct pinion angle is radically different between what is required for the OE driveshaft vs. an aftermarket CV driveshaft. The wrong pinion angle will cause drivetrain vibrations.

When converting from the OE driveshaft to a CV driveshaft, the rear axle's pinion angle must be raised so it is at the same angle the driveshaft is.
Guys, I am right there with you, but I am telling you, mine is good. I installed the Zone 3" lift and the included TC drop. I had vibes even though many others didn't. I added 2 more washers to lower it more and still had vibes.

Along comes the Advance Adaptors SYE and TW DS. I was waiting on my RUACA's to come before I did the job but decided to just do it anyways and drive in 4Hi with no rear DS till they came in.

After the SYE install I decided to hook up the rear DS just to see where the pinion angle was. Much to my surprise it was about 3 degrees off of each other (rear pinion and DS). For kicks and grins I decided to drive it and WOW what a difference it was. Smooth as can be.

I am still going to install the RUACA's when they come this week and replace the rear track bar. The control arms are all stock and I am the first one to mod this suspension.

I know it's weird but its working great; no RUACA's installed.
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Old 05-21-2012, 02:23 PM   #8
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Guys, I am right there with you, but I am telling you, mine is good. I installed the Zone 3" lift and the included TC drop. I had vibes even though many others didn't. I added 2 more washers to lower it more and still had vibes.

Along comes the Advance Adaptors SYE and TW DS. I was waiting on my RUACA's to come before I did the job but decided to just do it anyways and drive in 4Hi with no rear DS till they came in.

After the SYE install I decided to hook up the rear DS just to see where the pinion angle was. Much to my surprise it was about 3 degrees off of each other (rear pinion and DS). For kicks and grins I decided to drive it and WOW what a difference it was. Smooth as can be.

I am still going to install the RUACA's when they come this week and replace the rear track bar. The control arms are all stock and I am the first one to mod this suspension.

I know it's weird but its working great; no RUACA's installed.
You missed the point. It's not that we don't believe you don't have any vibrations. You can still be causing premature wear even though everything "feels" smooth. If you were to run that way for a while, you would probably notice your pinion seals start to leak if they aren't already, etc.
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Old 05-21-2012, 02:54 PM   #9
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Guys, I am right there with you, but I am telling you, mine is good.
Then use the correct verbiage to avoid confusing the OP. To phrase it correctly, you've got a coincidental situation. The "every jeep is different" phrase hardly ever holds any weight. Sure, a windshield frame not perfectly bolting up to another TJ could fit that phrase well. But when it comes to the reasoning behind setting the pinion inline with the drive shaft--that's strictly mathematical. And, as I'm sure you know, there's no such thing as a grey area in mathematics. It's either right or wrong. So as you currently sit, you're at the boundary of the acceptable range for the u-joint operating angle. That's all there is to it.

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Old 05-21-2012, 05:30 PM   #10
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Then use the correct verbiage to avoid confusing the OP. To phrase it correctly, you've got a coincidental situation. The "every jeep is different" phrase hardly ever holds any weight. Sure, a windshield frame not perfectly bolting up to another TJ could fit that phrase well. But when it comes to the reasoning behind setting the pinion inline with the drive shaft--that's strictly mathematical. And, as I'm sure you know, there's no such thing as a grey area in mathematics. It's either right or wrong. So as you currently sit, you're at the boundary of the acceptable range for the u-joint operating angle. That's all there is to it.

I was only trying to answer the original question. My passive-agressive nature insists I get one final word in before I give up the fight so, based on my extremely limited experience and my current setup, my answer remains "maybe". Is my setup at the boundary? Perhaps, that is why I am still going to install the RUACA's when they get here. I am sitting at 3 degrees with no changes to the axle alignment.

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