Owners manual

083116
Installation Instructions*
1) Park vehicle on level hard surface. Engage emergency brake. Place blocks in front and behind
front wheels to prevent rolling. Observe all safety precautions and wear safety glasses.
2) Raise rear of vehicle allowing the axle to hang freely. Support the frame using safety jack stands.
3) Attach Upper Frame bracket (Item A) to the top of the SumoSpring (Item B) using two 3/8-16x3/4”
serrated flange hex bolts (Item E). Attach the Lower bracket (Item C) to the bottom of the
SumSpring using one 3/8-16x3/4” serrated flange hex bolt (Item E) as in Diagram A above.
4) Insert two 3/8-16 x 4” carriage bolts (Item G) into the two square openings in the lower bracket
(Item C) in such a way that they straddle the factory spring-pack. Position the lower bracket so that
the shorter end down-stand fingers capture the factory u-bolt (see Diagram C below).
5) Secure the lower bracket (Item C) to the factory spring-pack using the u-bracket strap (Item D) the
two carriage bolts (Item G) two 5/16” washers (Item H) and two 3/8-16 Top-lock nuts (Item I).
NOTE: On passenger side, position u-bracket strap (item D) as shown in Diagram B below to clear
brake caliper bolt.
Diagram B Diagram C
6) Repeat steps three through five on the opposite side of the vehicle.
7) Jack up axle until Upper Frame Bracket (Item A) is in correct position on frame with the two bottom
holes aligned with the existing 5/8” holes in the frame as shown in Diagram D below. Mark and drill
two upper holes using a 7/16” drill bit (ensure clearance on all cables/service lines inside the frame
prior to drilling). If the two existing holes mentioned above are not in the frame then they will also
need to be drilled. Drill these two holes exactly mid height on the frame (this occurs on vehicles
post 2008) as seen in Diagram D below.