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 > Sumo Springs on 2022 F350 SRW

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MNRon

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Posted: 06/04/22 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

I installed 2800lb Sumo Springs (yellow) on my F350 a week or so ago. Have pulled our 5er ~1k miles with them and found one of them torn nearly in two, and the other one starting to have a banana bend. I noticed that they didn’t contact the bump stop directly in the middle when installing and suspect that’s the cause. I have an emai in to sumosprings but don’t expect an answer for a couple days given it’s the weekend.

Has anyone had this issue?
TIA


Ron & Pat
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fj12ryder

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Posted: 06/05/22 04:33pm Link  |  Quote  |  Print  |  Notify Moderator

Just curious, but aren't Sumosprings just glorified bump stops?


Howard and Peggy

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MNRon

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Posted: 06/05/22 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

Fj12ryder - yes. Bigger and spongeeer bump stops that eliminate a couple inches of squat…unless they tear off like mine did…

fj12ryder

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Posted: 06/05/22 10:11pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the reply, because I wasn't sure if there was some kind of rebound damping like a shock absorber.

riltri

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Posted: 06/06/22 05:27am Link  |  Quote  |  Print  |  Notify Moderator

I have around 900 miles of towing on mine and they show no signs of wear...just looked. They appear to make contact the same as the factory stops. They eliminate my squat and provide a very smooth ride. I have a '22 F250.
Interested in what you find out!!


Blue Ridge Mtns - NC

JIMNLIN

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Posted: 06/06/22 05:34am Link  |  Quote  |  Print  |  Notify Moderator

Both serve a different operation.
Bump stops will stop the rear suspension from solid steel contact at full compression.

Sumosprings replace the bump stops but their job acts like a upper aux over load spring pack. They can be set up to only make contact after so much load and progressively stiffen....or set up to contact with no load.

Sounds like the OP was sent the wrong springs or they were ordered wrong.

I use them on the wifes 1500 chevy pulling 10k and 12k car haulers. Works great.


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valhalla360

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Posted: 06/06/22 06:20am Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Just curious, but aren't Sumosprings just glorified bump stops?


You could easily claim airbags are glorified bump stops and be equally wrong.

Sumos look like oversize bump stops but they function differently (as do airbags).

A bump stop is a fail safe that shouldn't come into use unless you overload the springs (could be overloading, big bump or some combination). While far better than the axle hitting the frame, they are very harsh.

Sumos should be engaging in normal operation well within the weight limits.

They are progressive which means, when you first start to engage them, they provide only a small resistance per inch of compression. This results in a relatively soft ride. Then as they compress more, the resistance per inch of compression increases providing more support. This provides the support without the harshness. They are a compromise between timbrens and airbags.
- Timbrens aren't progressive, so running empty, they tend to be harsh when they engage (not as bad a bump stop).
- Airbags can be adjusted to the load but they are more expensive and require upkeep.

To the OP's question, obviously, if they are not aligned with the support, it will tend to bend rather than compress them. My guess is you either used the wrong mounting holes or got the wrong mounting bracket. On our 2008 F250, they line up to provide straight compression along the axis of the spring.


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fj12ryder

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Posted: 06/06/22 07:38am Link  |  Quote  |  Print  |  Notify Moderator

Thank you for the extended explanation. I wasn't really aware of the progressive part of the equation.

Cummins12V98

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Posted: 06/06/22 10:45am Link  |  Quote  |  Print  |  Notify Moderator

Why not add airbags and set to have the truck run level. Bilstien's are another good add along with proper tire pressure based on load.


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valhalla360

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Posted: 06/06/22 11:31am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Why not add airbags and set to have the truck run level. Bilstien's are another good add along with proper tire pressure based on load.


They are a 3-4 times the upfront cost and they require maintenance and adjustment.

And before you say it...Installed incorrectly, they won't last long either.

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