I'm not 100% sure but those Tuff Country one's look like the shorter ones. 3" is alot of add-a-leaf...will probably stiffen it up quite a bit. To be honest I didn't notice a real big difference with mine...maybe stiffened it up a bit but nothing that I really notice. It was placed within the spring pack, not at the very bottom. I was told that makes a difference on how stiff it rides.
I'm at 6" of block now and not sure if I have axle wrap or not. I have bad take off shudder but the driveline shop told me it was all due to my angles and carrier bearing. I was going to order the OUO traction blocks but have to spend $700 first to get a CV and better style carrier put in my rear driveshaft. I'm getting that done next week so should know then if I have an axle wrap problem. Going from 6" to 8" is really costing me some $$.
Thanks, just sold the bike to a guy in Saskatchewan actually. I bought a Haulmark race trailer for our dunes trips so the bike had to go. I want to start building another WCC CFL this winter...that or murder out a HD Springer Classic.