The colors represent the spring density. They are made with three different densities and can be identified by color and the last part of the part number. The blue SumoSprings (light density) end in a -40, black (medium density) end in a -47, and yellow (heavy duty) end in a -54. Some applications will only have one color available and is what the manufacturer has determined works best for your vehicle make and model. Other vehicles may have multiple colors to choose from and what you are using the vehicle for will help determine which color to pick.

They are both designed to do the same thing, but the major difference is that SumoSprings do not use air the same way a traditional air suspension kit does. With traditional kits, you will need some source of air to inflate the air bag. You inflate and deflate as needed. SumoSprings use air pockets in a urethane material that does not require inflation. They are always ready to go and will never leak.

They use what is considered a progressive spring rate spring with a cushion material that will increase your ride support with a heavy load. They will have a positive impact on your ride quality and will not stiffen the ride as other helper springs may.

Both will provide extra support and work in a very similar fashion. The feedback that we have received is that SumoSprings typically provide a softer ride than a Timbren SES Bump Stop kit. The foam type spring is more progressive and tends to expand and contract better with the load. Both are good, and it will depend on the application, but overall, we prefer SumoSprings over Timbren as they are less harsh.

They will not have any impact on your ride height when you are not towing. SumoSprings are designed to help maintain factory ride height, but will not increase it over stock levels.

They replace your bump stops and typically can be used with a fifth wheel hitch or a gooseneck trailer hitch. We recommend reading the instructions for your specific application and then looking at where your fifth wheel hitch mounts. Because they mount in place of your bump stops it is rare that they will not work with a fifth wheel hitch.

This will depend on the kit. Most kits do not require drilling. As with any suspension kit, we recommend reading the instructions to determine what is required for a successful installation.

No air is required. No air lines, leaks, or air pressure to worry about.

They are designed to be progressive, so If you have a heavier load on one side of your truck, as you compress the SumoSpring on that side, the SumoSpring is going to react and support a greater load, thus helping it level from side to side.

Yes, if you are mechanically inclined and have the basic tools you can install SumoSprings yourself. Most of the kits are bolt on installation and are not technically difficult to install.

The capacity listed on our site for SumoSprings is for the complete kit and not per spring.