personal opinion on ride quality, but my springs worked and rode alot better after i took out that 11 leaf, if you look its a evenly progressive pack,leafs are all about 2 inches shorter on each end, and the 11 is put in after the pack is built, it also has more arch and the other springs pull it down to their arch, it does lower it about .5 in at first and they did settle a little bit more more but it is much nicer.