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Old 04-03-2019, 01:37 PM   #1 (permalink)
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LJ SYE needed?

I recently bought an '06 LJ that's lifted 3". I'm planning to go up to a 4.5" lift. At what point does the SYE become a necessity on the LJ? At 4.5" I've heard both that I'll be fine and that at absolutely need one
I'd like to hear some real world experience here.
While we're on the topic, after installing a SYE and CV driveshaft, I'm aware that the rear axle needs to be rotated to obtain proper u-joint angle. I've heard that this will necessitate relocating the spring mounts, relocating the track bar mount, and can cause shock interference. What's the real story here as well?
Thanks in advance

Last edited by Southtowns27; 04-03-2019 at 01:40 PM.
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Old 05-22-2019, 02:08 PM   #2 (permalink)
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My 05 LJ has an SYE with a 4" suspension lift and a 1" deep (UCF) tummy tuck. Pinion angle is about 16 degrees off horizontal. I have shock extender/relocators on the axle, and a track bar relocation bracket. If you don't have an SYE and a CV (Double Cardan) shaft you are going to eat up over half your potential down travel in the driveshaft before binding (16 degrees out of about 30 with a 1310 u joint) just lining the Driveshaft up. The SYE and CV shaft also let you point your pinion up, ramping it towards your rock/obstacle a little. The stock transfer case output is also a huge lever arm with a small diameter. The SYE also upgrades your output from a 27 spline to a 32 spline, and reduces that lever's length hanging off the back of your tcase. It's not just about getting more driveshaft length and a better driveshaft angle - it gets you more girth on your output shaft.
Coils are no more crooked than any lifted TJ without relocating the buckets. Maybe down the road if it bothers you, you can scoot the buckets back on the frame and put in some outboarded shocks.

Last edited by Aggie01; 05-22-2019 at 02:09 PM.
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Old 07-09-2019, 09:48 PM   #3 (permalink)
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Quote:
Originally Posted by Aggie01 View Post
My 05 LJ has an SYE with a 4" suspension lift and a 1" deep (UCF) tummy tuck. Pinion angle is about 16 degrees off horizontal. I have shock extender/relocators on the axle, and a track bar relocation bracket. If you don't have an SYE and a CV (Double Cardan) shaft you are going to eat up over half your potential down travel in the driveshaft before binding (16 degrees out of about 30 with a 1310 u joint) just lining the Driveshaft up. The SYE and CV shaft also let you point your pinion up, ramping it towards your rock/obstacle a little. The stock transfer case output is also a huge lever arm with a small diameter. The SYE also upgrades your output from a 27 spline to a 32 spline, and reduces that lever's length hanging off the back of your tcase. It's not just about getting more driveshaft length and a better driveshaft angle - it gets you more girth on your output shaft.
Coils are no more crooked than any lifted TJ without relocating the buckets. Maybe down the road if it bothers you, you can scoot the buckets back on the frame and put in some outboarded shocks.
What did you do to get the UCF to fit on your LJ? I am thinking about going with one on my 05, I also am going with 6 bolt dana 44's front and rear and possibly an atlas. I already have a 4" lift, adjustable control arms and the stuff to outboard the rears and 12" fox shocks. I live a mile from Tom Woods, so drive shafts are not an issue for me. Tim
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Old 07-10-2019, 06:26 AM   #4 (permalink)
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Originally Posted by astjp2 View Post
What did you do to get the UCF to fit on your LJ? I am thinking about going with one on my 05, I also am going with 6 bolt dana 44's front and rear and possibly an atlas. I already have a 4" lift, adjustable control arms and the stuff to outboard the rears and 12" fox shocks. I live a mile from Tom Woods, so drive shafts are not an issue for me. Tim
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I put the AEV belly-up skid on my '06 LJ. I added a 1" body lift and a 1" motor mount lift. I also rotated the Atlas II almost flat.
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