Installing SYE - How much axle shim to use? (4" lift) - JeepForum.com
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Unread 09-10-2007, 09:44 PM   #1
Mark_ZZ3
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1993 YJ Wrangler 
 
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Installing SYE - How much axle shim to use? (4" lift)

So just trying to sort out if I can shim my axle or if I need to re-weld the perches in the right spot.

I have a 93 YJ with 3.5" BDS springs. Running "fronts" on both front and back. Xfer case in stock location. Standard SYE. 1" MML. Stock shackles in back, but 1" longer in front.

I'll end up just installing the SYE and seeing what my angles are, but I was curious was others found out. It would be great if I could get away with a shim and no welding.

Mark.

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Unread 09-10-2007, 10:13 PM   #2
jeep795
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if anything throw on longer shackles in the back as well, and then see how much you need to shim
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Unread 09-10-2007, 10:17 PM   #3
flysyj
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the proper angle on an sye..is the pinion yoke..pointing almost straight at the t-case yoke, a few degrees low is prefered, becuse of wrap at acceleration..i have an re-4" with an advance adaptors sye-(not the super short type) i kept in my 6* shim and the t-case/skid plate 1" drop in, to get the proper angle-no vibes~fly
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Unread 09-10-2007, 10:33 PM   #4
wranglerswrock
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i have a 3.5 black diamond, and although i figured a major benefit to the sye was gonna be the tummy tuck, i had to do what the guy above said exactly. 6* shims with a transfer case drop got it to where it needed to be. I am puttin on a 1" body lift, and 1" mml... i am hoping that will bring it closer, so i can at least have less of a transfer case drop, or in a perfect world, none at all =)

hope this helps too

and btw, every jeep is different... like, for real. so dont be surprised if you are just good to go striaght up liek you are, or if you have to reweld the perches. its a 50/50 shot
=)
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Unread 09-10-2007, 10:52 PM   #5
Mark_ZZ3
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Well geez ... I did not think about leaving the transfer case drop in. It's only a 1" ... maybe that is the interium solution?

The real catch is I have a D44 in the works and don't want to spend a ton of cash on the D35, but the vibrations are bad with my new springs. So I figured the SYE would need to go in.

Hmm ... this does offer some new ideas ...

Mark.
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Unread 09-11-2007, 12:25 AM   #6
sentinal02
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8 shims did it for me for 4" springs and 1" shackles with no T-case drop.
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Unread 09-11-2007, 07:37 AM   #7
bamato
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Like sentinal said. I have 3.5"s of lift and run 1 inch shackle. 8° shims worked perfect for me. Best way to do it is to go out and buy a cheap angle finder for about 10 bucks, measure the pinion angle, then measure the driveshaft angle. They should be identical, assuming you have a cv shaft, and are still running the dana35. If you are running an axle with any sort of offset, different degrees are necessary.
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Unread 09-11-2007, 11:24 AM   #8
yjbubba
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I put an RE 4.5 lift and AA SYE on my 89 and without dropping the skid plate I needed 12* of shim, I opted to fab up new perches and weld them on.
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Unread 09-11-2007, 11:30 PM   #9
Mark_ZZ3
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Quote:
Originally Posted by yjbubba
I put an RE 4.5 lift and AA SYE on my 89 and without dropping the skid plate I needed 12* of shim, I opted to fab up new perches and weld them on.
That is sort of where I was thinking it was going to be. I'm going to have to just install the SYE and measure it up. No other way to do it ... just add some time to the project.

Great responses. Many thanks.
Mark.
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