Swapped in the Belltech 5305 coils yesterday. On the test drive/shakedown to settle the suspension, it felt great as far as stability. But, if they're any softer than the TJ coils, it may be something like 10% softer- barely noticeable. Everyone talks about how great the 5305s ride and many complain that they're too soft. I was hoping for too soft and at least 4" of drop. After a very aggressive shakedown, I parked it back in the shop and measured the rear to be right at 3/4" higher than with the TJ coils.
So, I lost drop and they ride essentially the same. Oh- they're also noisier because of the dead coils compressed against each other. They haven't been used in a good while and have some surface rust on the contacting edges of the dead coils. I expect the noise to subside after the surface rust rubs off so I'm not so concerned about that.
A Jeep buddy told me he's had it take months for springs to settle. I don't expect these to settle 3/4", but I'd like to get them settled ASAP. I barely drive it, so I'm probably gonna load a few hundred pounds of weight in the back and let it sit loaded for a few weeks while it sits in the shop.
After that, I can trim off some of the dead coils and probably get upwards of 2" more drop if I wanted to trim that much. But, my concern at the moment is trying to find why mine rides so damned firm when many others say theirs rode soft.
I also compressed a shock to ensure that it had plenty of travel and wasn't bottoming out. It compressed about 4" from it's length when mounted at the lowered ride height, which is plenty and coincides with the listed specs of the shock.
More experimenting to follow...