Shim Installation Question ? - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 11 (permalink) Old 06-14-2019, 03:51 PM Thread Starter
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Shim Installation Question ?

So after reading some of the latest posts in "What have you done" I have become more concerned about the vibration that I incurred (25-45 MPH) after I installed the lift. I'm running Deaver AAL's. I have three degree shims from PRG but I didn't install them because I didn't feel good about it. Basically what bothered me was that with the shim in place I lost the "headspace" on the centering pin/bolt where it inserts into the axle housing bracket. See example pic. As far as the vibration goes I know I have to at least start with getting the shims in. I really don't want to have to go with a custom driveshaft but I will before I start destroying pinion bearings and such. Here is a picture of the angle of my drive shaft and the yoke as it is now. What is the definitive method for the shim installation. Do you just lay them in there between the leaf and the bracket and crank the U-bolts down? How do you insure exact center?

BTW I'm three inches on the rear.

Example
https://imgur.com/s4BMrce


Angle
https://imgur.com/8eX1KId


Yoke
https://imgur.com/R78Koga

Last edited by BlueRidgeX; 06-14-2019 at 03:54 PM.
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post #2 of 11 (permalink) Old 06-14-2019, 04:36 PM
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Originally Posted by BlueRidgeX View Post
Do you just lay them in there between the leaf and the bracket and crank the U-bolts down?
This is what I did. The bottom plate for the ubolts is centered on the pin, so I'm relying on the ubolts to keep the axle lined up.
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post #3 of 11 (permalink) Old 06-14-2019, 04:43 PM
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I'll have to verify this when I leave work this afternoon but I'm 99% with the DAAL pack I got from PRG you insert the center pin through the shim and leaf pack so that the head of the center pin will still sit in the hole in the axle housing that's made for the center pin (in blue on the attached picture)

If you don't have a shim that you can do that with I would call up PRG or Nisstec and tell them you want 3* shims that you put the center pin through. Should solve all of your problems.
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post #4 of 11 (permalink) Old 06-14-2019, 05:30 PM Thread Starter
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Originally Posted by duxsterra View Post
I'll have to verify this when I leave work this afternoon but I'm 99% with the DAAL pack I got from PRG you insert the center pin through the shim and leaf pack so that the head of the center pin will still sit in the hole in the axle housing that's made for the center pin (in blue on the attached picture)

If you don't have a shim that you can do that with I would call up PRG or Nisstec and tell them you want 3* shims that you put the center pin through. Should solve all of your problems.
Here is a picture of the shim that I have. You can see that the depth of the shim negates the headspace on the bolt so it ends up flush where it meets up on the bracket. FTR the allen bolt I'm using here for this example because it's the only thing that I had handy for the photo. It seems that the center bolt head would need to be double the height in order for it to insert correctly into the bracket.
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post #5 of 11 (permalink) Old 06-14-2019, 05:36 PM
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I think the hole in your shim is too big - the head of the center pin should be clamping it in basically as part of the leaf pack.
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post #6 of 11 (permalink) Old 06-14-2019, 06:18 PM Thread Starter
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Originally Posted by Zack. View Post
I think the hole in your shim is too big - the head of the center pin should be clamping it in basically as part of the leaf pack.
I here what you are saying. As shipped the holes were drilled for OD of the threaded part of the bolt not the head. Absolutely no chance of the head inserting. I used a stepper bit to drill them. After they were redrilled, the head fit fine without any "slop" but not clamping or pressed in so to say. I still don't understand how this would provide any ability for the shim not to not slip on the axle bracket other than the shear torque of the u-bolts. It seems that it would help with the alignment to a degree.
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post #7 of 11 (permalink) Old 06-14-2019, 09:11 PM
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Wait...so it sounds like they were shipped correctly. The hole should only fit the threaded diameter of the center pin and the head of it should rest on top. That ensures that the head of the center pin will fit into the holes on the axle that your previous center pins fit in. That center pin (along with the u bolts) will keep the axle from sliding around.

If you used a step bit to enlarge the hole so the head of the center pin would slide through you're out a set of shims and need to reorder.

Edit: added a picture of what it should look like that I found elsewhere on the site. Long story short, if you want to add shims you'll need to get two new ones and install like mentioned above. Thicker part goes toward the front of the truck.
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File Type: png FAFD598F-28E6-48E0-97B4-0803B797B3F8_1560561240021.png (1.08 MB, 15 views)
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Last edited by duxsterra; 06-14-2019 at 09:15 PM.
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post #8 of 11 (permalink) Old 06-15-2019, 06:37 AM Thread Starter
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Quote:
Originally Posted by duxsterra View Post
Wait...so it sounds like they were shipped correctly. The hole should only fit the threaded diameter of the center pin and the head of it should rest on top. That ensures that the head of the center pin will fit into the holes on the axle that your previous center pins fit in. That center pin (along with the u bolts) will keep the axle from sliding around.

If you used a step bit to enlarge the hole so the head of the center pin would slide through you're out a set of shims and need to reorder.

Edit: added a picture of what it should look like that I found elsewhere on the site. Long story short, if you want to add shims you'll need to get two new ones and install like mentioned above. Thicker part goes toward the front of the truck.
That makes perfect since now. Where I went wrong was the shims got separated from the bolts in the parts shuffle and by following the instructions on the deavers, which called for flipping the existing deaver bolts (as shipped). So basically I used the wrong bolts. I will have to reorder. Thanks a bunch. Definitely a face slapper.

Last edited by BlueRidgeX; 06-15-2019 at 09:58 AM.
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post #9 of 11 (permalink) Old 06-15-2019, 10:42 AM
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My shims from PRG came with slightly longer pins. I have yet to install them, so cannot confirm w/ certainty. I'm taking Greg @ PRG's word at it now.
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post #10 of 11 (permalink) Old 06-15-2019, 10:53 AM
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The pins Greg ships out will be longer than you need. You typically have to grind off the excess bolt when you have everything put together.
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