Originally Posted by TJ.jim
so how would a properly bump stopped spring with a spacer on top be more prone to coil bind then one without?
spacers reduce the amount of space the spring has to compress into. most lift coils are at full bind within the stock towers length, or actually need more space...more specifically it depends on the coil diameter, the amount of "turns" and the coil length.
So, if you wanted to get really precise about it, you would put your current lift coils into a press and subject them to full coil bind. Then you'd measure this distance and make sure the distance was available to compress the coils into. here's a write up on that: Yellow, Red, Long and Soft.... - JeepForum.com
Also, if you added 2" coil spacers to 4" of lift, you'll need new shocks because you'll have 2"+4" = 6" of lift, so you'll need 6" lift shocks, in addition to more bumpstop. But the 4" coils won't be long enough when at full droop, so the springs will unseat under droop - which will make them basically useless from a traction and rig stability standpoint.