axle shim along with lift block

[dholder]

Can I use a 6 degree axle shim with a 2.5 in lift block? I think it is an old Rancho lift kit that I will be replacing in the future with a new kit. I have some driveshaft vibration right now.

 

[BRONCROB]

You could just long enough to find out if that fixes the vibration,then get the right tapered blocks.I have seen the shims break in half and wouldn't reccomend them for anything permanent.

 

[broncodriver99]

X2 on what Broncrob said. I wouldn't use both permanently.

 

[Broncobowsher]

Test drive = OK
Correct fix, NO. They make angled blocks. If you can't find them, get yours milled.

 

[dholder]

Yeah my blocks are angled already, but not enough. Would the shim go between the block and the spring perch?

 

[bronconut73]

Depends.
Some shims just sit in there.
Others are bolted in with the leaf pack bolt.

 

[dholder]

I am considering the steel shim that is bolted in with the leaf pack. So i guess I would place it between the block and the spring. Is there any reason I can't do that?

 

[DirtDonk]

Not that I'm aware of. Should be just fine.
And good steel bolt-on shims should not split. Ever.
I know what the others are talking about though, which is why I stopped recommending the old cast aluminum shims over 25 years ago. Sure, they'll get you home in a pinch, but like said, they're not reliable enough in all situations to deserve permanent status.
But they are inexpensive...

We sell 6° shims only (http://www.wildhorses4x4.com/product/Steel_6degree_shims) because that's the most common taper needed for our springs. It might be too much for your setup, given that the blocks are already tapered slightly (usually about 2-3 degrees) but will depend on your angles. The only ways to tell though, are to either install a set, or do the math beforehand.
These shims will bolt to your spring pack, so would indeed go between the spring and the block.

The old school shims that simply sat between two components could fit into either position, but were still best between the spring and the block. That's because only the spring's centerpin was modifiable to get enough reach to go through the shim (most people didn't bother) and keep it located safely.
All in all, a well-made steel version is better than aluminum. And bolt-on is better than loose mounting.

Paul

 

[DirtDonk]

Got a pic of your pinion angle? When does it vibrate? Acceleration only? Deceleration only? Cruise?

Paul