I didn't use the front spacers because I have OME 2607 in the front and I just needed the rear stuff to level things out a bit.
I used the 2 degree shims that came with it and was getting bad vibes at 30-35mph. This picture is with those shims installed.
To me it looked like it was overcorrected so I took them out and things got worse. I just through 300 pounds of weight in the back and things are 80% better.
What's the next step?
-put the 2 degree shims back -remove the overload -drive it a while???
One thing to note is that it seems very stiff. The 300 pounds didn't even drop it a full inch. I can barely make it squat when jumping up and down on the bumper.
Your pinion looks like it’s at a pretty extreme angle. Are you sure you installed the shims correctly?
Also they make different angles of shims and it’s pretty much trial and error as it seems there is no one size fits all on the Xterra.
From PRG's website:
"These are a 2 leaf AAL designed to lift the rear of your 2005+ Xterra 2.5" and provide much-needed bottoming resistance while still providing a better ride than stock (even when empty). These springs are designed to replace the stock overload leaf (combining them is not recommended). "
That may be the direction I go. I am not going to take it back apart until I get another set of u-bolts in hand though. The ones I have are already stretched and the threads are marred up. I did manage to locate the AAL instructions for the specific set I have. They do say to put the overload back on. NISSTEC AAL INSTRUCTIONS
That's really one of the only things left to try other than purchasing different degree shims and trying them.
I'm not a doctor, but the overload does not affect stiffness, it prevents the leaf pack from going inverse if too much load is applied. It is just a flat piece of steel with no flex at the bottom of the pack. I believe it is recommended to remove when you do an AAL because it just increases the overall thickness of the pack in addition to the AAL you added and is perhaps dead weight.
Out of curiosity, what is your total height in the rear now? (Stock height - sag + lift) I needed 2 degrees for 2" of lift by deaver AAL after removing overload. My guess is you are lifted more than that.
I have the same issue with the same nisstec/deaver AAL .... didn’t reach to any solution and nisstec guys didn’t help too .... all what they said I shouldn’t face the issue
Im at 2.5" lift with OME leafs and 1" shackle.
I started with a 2.5 deg. shim and had the same mid 30 mph vibration.
went to a 4 deg. and vibration stopped,more is better?
I didn't use the front spacers because I have OME 2607 in the front and I just needed the rear stuff to level things out a bit.
I used the 2 degree shims that came with it and was getting bad vibes at 30-35mph. This picture is with those shims installed.
To me it looked like it was overcorrected so I took them out and things got worse. I just through 300 pounds of weight in the back and things are 80% better.
What's the next step?
-put the 2 degree shims back -remove the overload -drive it a while???
One thing to note is that it seems very stiff. The 300 pounds didn't even drop it a full inch. I can barely make it squat when jumping up and down on the bumper.
View attachment 131711
I didn't use the front spacers because I have OME 2607 in the front and I just needed the rear stuff to level things out a bit.
I used the 2 degree shims that came with it and was getting bad vibes at 30-35mph. This picture is with those shims installed.
To me it looked like it was overcorrected so I took them out and things got worse. I just through 300 pounds of weight in the back and things are 80% better.
What's the next step?
-put the 2 degree shims back -remove the overload -drive it a while???
One thing to note is that it seems very stiff. The 300 pounds didn't even drop it a full inch. I can barely make it squat when jumping up and down on the bumper.
View attachment 131711
I would replace the u-joints fronts and rears. Minor effort but worth a shot since lifting has changed the angles of the drive shafts. Might just be the originals aren’t happy
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