I have run my RK 3.5 progressive springs for nearly two years now on a pretty light weight rig. No fenders, no spare, no top, very minimal rear bumper. I netted probably around 4-5 inches and I was pretty happy with the ride.
Now as I'm leaning more towards an overland rig I have added tire carrier, spare, roof rack, full MC fender setup, winch, Roof Top Tent... So I have certainly changed the characteristics of my ride as far as "sprung weight" is concerned. While the ride has softened up a bit I think I am now riding on some weird transition point where the tighter portion of the spring turns to a more loose coil. So now I am getting a very irritating groaning when my suspension cycles.
I am thinking about switching to a 5" linear spring. Thinking maybe Evo Plushrides, RK 5" linear, or maybe the curries.
Any thoughts on the groaning (almost positive it's from the coils), Or anyone go from progressive to linear or duel rate springs?
*as it may come up... The full setup is a full set of RK mid arms, Fox JK tuned 4"-6" Resi shocks, and a Currie Antirock.