WTB shims

[gearhead1985B]

In orDer to install my new leaf springs i need a 15 degree shims for my pinion angle so if any one has any let me know

[kirksjeep]

Wow thats a pretty steep shim.  My RE XD 4.5" kit only came with 4 degree shims and a T-case drop kit.  Even after my SYE and taking the T-case drop I only needed 6 drgree shims.  I have some 6 degree shims you can have, but they are only aluminum since I knew I was going to an 8.8 soon afterwards.

If you need 15 degree shims you are going to need steel ones, which arn't cheap.  Most places I found when looking for mine only sell up tp 6 deg.  15 degree shims would most likely have to be made.

Here is a good tread from Jeep Forum on Shims:
http://www.jeepforum.com/forum/f12/shim-advice-after-sye-cv-install-793986/

How much lift did you put in?  Did you put in a T-case drop or a SYE?

[calvynandhobbs]

Most leaf springs already come with shims built in for the lift that you are putting in. I've never had to buy shims on top of what came already built in.

[gearhead1985B]

I bought 2.5 inch springs and i got like 4 inches of lift and the 15 degrees is what i calculated from having to move up the pinion three inches to make the drive shaft line up

[kirksjeep]

A few more questions? 
1.  Did you add a T-case drop kit?  or did you put on a SYE?  Anything over 2" requires one or the other.
2.  Are these new or used springs?  Which Brand?

Check out this link for Drive shaft angles:
http://www.4xshaft.com/index.html

-For a 4" lift with a SYE/CV drive shaft you will need a 6 deg shim
-For a 4" lift with stock drive shaft and a T-case drop kit you will need a 4 deg shim
-For a 2.5" lift with SYE/CV drive shaft you will need a 4 deg shim
-For a 2.5 lift with stock drive shaft and T-case drop you will need a 2.5 deg shim

I put a 2.5" lift on my Bro-in-law's YJ and at first it sat about 3.5-4 inches but settled to 2.75" after the first time we flexed it.  He has the Rubicon Express (not XD) so it was a good kit.  I would expect your springs to settle.  My 4.5" lift sat at 5" for about 6 months but now is at 4.5 front and 4 1/4 rear (mostly due to the diameter of the 8.. 

[gearhead1985B]

A few more questions? 
1.  Did you add a T-case drop kit? no or did you put on a SYE?no  Anything over 2" requires one or the other.
2.  Are these new or used springs?  new Which Brand? Pro-comp

Check out this link for Drive shaft angles:
http://www.4xshaft.com/index.html

-For a 4" lift with a SYE/CV drive shaft you will need a 6 deg shim
-For a 4" lift with stock drive shaft and a T-case drop kit you will need a 4 deg shim
-For a 2.5" lift with SYE/CV drive shaft you will need a 4 deg shim
-For a 2.5 lift with stock drive shaft and T-case drop you will need a 2.5 deg shim

I put a 2.5" lift on my Bro-in-law's YJ and at first it sat about 3.5-4 inches but settled to 2.75" after the first time we flexed it.  He has the Rubicon Express (not XD) so it was a good kit.  I would expect your springs to settle.  My 4.5" lift sat at 5" for about 6 months but now is at 4.5 front and 4 1/4 rear (mostly due to the diameter of the 8.. 

with the 4 different lift kits i have helped install at the shop a 4" rc a 4" procomp and a 2.5" rc for a yj and a 6" rc on a tj the tcase drop is only 1"

so with a 4" lift kit and a 1" t case drop that is roughly 3" differance between the t case output and the pinion so with a 2.5" lift why do i need a tcase drop

how should i set up the pinion. The 15 degrees was pointing the pinion right at the the driveshaft but from what i read on the links kirk posted i will only need an 7.5 degree shim cause i need the joint angle at the tcase and pinion to be the same is that correct if i am running a stock ds

and the RE standard lift springs are rebadged Pro comps which is what i bought and i am running rear springs all the way around for the spring rate since that i have seen how stiff procomp springs are the rears are a little softer than the fronts and at $65 apeice and another $30 cheaper than new stock replacements is why i bought them and i am tired of junk yarding rear springs to have them become reversed arched in 2 months

i want to get these springs broke in and have them sag so that when i go soa next month i will be able to set my pinion angle correctly the first time

[kirksjeep]

There is a reason that RE provides a 1" T-case drop with even their 2.5" kits, with out it the drive shaft angle is too steep.  One of the reasons a SYE is to do away with the slip yoke, but it also shortens the Drive train so a longer drive shaft can be used.  When looking for shims only a few places even sell 8 deg shims, and generally only up to 6 deg is considered safe. 

You can ask Roger what happens when the drive shaft isn't lined up right, his old XJ pretty much ate a U-joint before the SYE and CV drive shaft.  Also remember that when the suspension droops the angle gets even steeper and puts a lot of stress on the U-joints.  If you only used your YJ as a Mall Crawler you could get away with not doing a T-case drop or SYE, but we all know you are going to beat on it.  Since you are going to need a SYE (possibly a super short SYE) and a custom built CV drive shaft with a spring over I would just go with a T-case drop and 2.5 deg shims for now.  You can order directly from RE and they give military discount.

 I have seen that you like the skinny pedal and when combined with bad drive shaft angles equals BANG!!!!!!

[gearhead1985B]

Kirk is there any way you could get me those 6 degree shims

[gearhead1985B]

I no Longer need those shims John at bumper to bumper found some shims in the back and i made a custom t case drop  the drive shaft Lines up and i am good to go for the rally as soon as i replace my rear u Joint

[kirksjeep]

Just make sure you test your Jeep out before we get on the road for the rally.  I can see you pulling into Groton Town House now, "hey guys I need to fix my Jeep again"

[gearhead1985B]

put 50 Miles On it last Night and Only had vibes Over 70