Sumo Springs SSF-106-40 Install
Taylorbob1, I believe you will see a different kind of improvement with the Sumos, because mechanically they do different things. With the Sumos I noticed that coach movement when walking was greatly reduced, because the Sumos mechanically resist downward movement of the coach toward the axle differently than leaf springs. The improvement of adding Sumos in addition to the Helwigs may not be as dramatic as without the Helwigs. After the first major upgrade, each additional upgrade will be incrementally better IMO.
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