FYI, if you have threaded shock bodies with coilover springs on threaded perches, and you can't raise the ride height as far as you would like, you can get some nifty aluminum spacers that sit on the bottom spring perch. I picked up a set from Advance Design for $48 ($16 each). They are 1" tall, which should give me something more than 1" extra ride height adjustment at each corner.

Why do I need these? Well, I have a set of M2/AD coilover shocks that came with 8" long springs. I could not raise the ride height high enough (i.e., I ran out of thread on the shock bodies), and I thought that I would have to buy longer springs. The springs have a 2.5" ID, but you can't get a 9" x 2.5" spring (from Eibach at least)-- you have to go to 10" springs. Aside from having to "spring" for a new set of springs, this would add (if I remember correctly) a pound or so of weight to each corner.

I considered going with 2.25" ID springs, which are available in 9" lengths (and weigh less), but then I would also have been forced to buy new threaded perches at each corner.

I called Advance Design for advice, and they suggested using the spacers instead. These things are pretty light. I didn't weigh them, but the spacers plus 8" springs are lighter than moving up to 9" or 10" springs. And $48 is definitely cheaper than a new set of springs.

Now I just need to make some time to uninstall and reinstall my shocks (I remember this job being a PITA...). When I get some miles on these things I will report back.

P.S. If you really want something trick, I saw one company (Hypercoil?) that had spring perches with needle (?) bearings built in. The idea is that as the spring expands and compresses, it can turn the top of the perch relative to the bottom of the perch, and the reduced binding makes the suspension more responsive.

 

I certianly see the need for such an item.

However, I would like to get a spacer with a two piece design so it can be installed without removing the spring from the shock.

I'm thinking about having a set custom made.

 

Hmmm, that's an interesting idea. Let me know how it works out.