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Old 11-21-2007, 09:13 AM   #1
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Curious about SYE

Been reading about SYE and drive conversion kits. As someone that doesn't know anything about the drive train of a vehicle - what exactly is the advantage of installing one of these kits

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Old 11-21-2007, 09:18 AM   #2
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Been reading about SYE and drive conversion kits. As someone that doesn't know anything about the drive train of a vehicle - what exactly is the advantage of installing one of these kits
In layman's terms, an SYE kit shortens the output shaft on your transfer case, allowing the use of a longer,CV jointed driveshaft. It will allow alot more driveshaft articulation without binding up like a shorter stock slip-yoke driveshaft. You see it alot as a cure for driveline vibes.

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Old 11-21-2007, 09:23 AM   #3
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And I assume that "drive shaft articulation" is something needed for heavy offroading but not necessarily for highway or light trail use.
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Old 11-21-2007, 10:22 AM   #4
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And I assume that "drive shaft articulation" is something needed for heavy offroading but not necessarily for highway or light trail use.
Pretty much. If you have 3" of lift or less, probably not something you need to worry about, seems to be when you get over 4" you start to see the more dramatic changes in rear driveshaft angles that cause the vibes. The SYE reduces the angle by moving the front end of the rear shaft forward, allowing a longer shaft at a less severe angle, less stress on joints. W/O one and w/ 4+" of lift, your rear driveshaft goes nearly vertical into your rear diff if you have your rear axle droop down while offroad somewhere. In that situation, you are almost sure to bust u-joints, etc, plus those sharp angles don't allow smooth operation on the road, causing the bad vibes.
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Old 11-21-2007, 01:19 PM   #5
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The only other thing to add is to note how the slip yoke driveshaft that you likely currently have operates. The output shaft that comes from your transfer case is built so that the rear driveshaft can literally slip back and forth as the rear axle articulates. Typically there is not a lot of slipping (only an inch or so) so, as the previous posters said, unless you have over 3" of suspension lift (not body lift--unless you do larger motor mounts), you'll likely not need to replace the current output shaft with a Slip Yoke Eliminator (SYE).

The SYE turns the output shaft into a solid mount and moves the slipping ability of your existing output shaft to the middle of the new driveshaft.

An easy way to picture this is to note how the slippage works on your rear shaft: all of it is done on the output shaft. If you disconnect the driveshaft from the rear axle, the shaft will literally slip off of the output shaft. Adding a SYE basically converts the rear driveshaft and related mounts to mimic how your front driveshaft works -- both ends are statically mounted and the slippage is done where the boot is in the middle of the shaft.

And, as previously mentioned, an added benefit of all this is the shortened output shaft length that can allow for a little longer rear driveshaft and hence a lessened driveline angle for larger lift vehicles.
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Old 11-21-2007, 01:23 PM   #6
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* 2 for the above

The only other thing to add is to note how the slip yoke driveshaft that you likely currently have operates. The output shaft that comes from your transfer case is built so that the rear driveshaft can literally slip back and forth as the rear axle articulates. Typically there is not a lot of slipping (only an inch or so) so, as the previous posters said, unless you have over 3" of suspension lift (not body lift--unless you do larger motor mounts), you'll likely not need to replace the current output shaft with a Slip Yoke Eliminator (SYE).

The SYE turns the output shaft into a solid mount and moves the slipping ability of your existing output shaft to the middle of the new driveshaft.

An easy way to picture this is to note how the slippage works on your rear shaft: all of it is done on the output shaft. If you disconnect the driveshaft from the rear axle, the shaft will literally slip off of the output shaft. Adding a SYE basically converts the rear driveshaft and related mounts to mimic how your front driveshaft works -- both ends are statically mounted and the slippage is done where the boot is in the middle of the shaft.

And, as previously mentioned, an added benefit of all this is the shortened output shaft length that can allow for a little longer rear driveshaft and hence a lessened driveline angle for larger lift vehicles.
Good point, I forgot that!

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