GEN 1 Sprung Under questions

boarder1995 said:

So, I'm considering going to a sprung under setup with Deaver +8 springs. I'll run with regular Fox3.0 for a while, so won't see any benefit for travel numbers. But might see some improvement with preventing axle hop. Who's running Deaver sprung under? Is it stiffer than the Deaver +3 stander over axle setup? Stiffer or softer than stock springs? I've got Deaver +3 currently and they're nice and soft. I don't want to lose that nice rear ride.

Eventually, I'll go with a bedcage or cantilever arrangement for the extra travel and more travel zone tune-ability with a greater number of bypass tubes (bedcage and 3.5 shocks).

I've FRF searched and didn't find any direct info on this. Thanks for any feedback.

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Hole Shot said:

Sprung under will cause driveshaft issues due to the way the axle moves. In lower horsepower applications/ranger it works well but in raptors not so much. Unless your going 4 link.


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Hole Shot said:

Boarder has said nothing about 4 linking, cantilever, and what do you mean by bed cage? Usually that is a four link setup. What is your definition of a bed cage. I bet you talk to svc or Rpg and they recommend you don't go sprung under.


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Hole Shot said:

Boarder has said nothing about 4 linking, cantilever, and what do you mean by bed cage? Usually that is a four link setup. What is your definition of a bed cage. I bet you talk to svc or Rpg and they recommend you don't go sprung under.


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SDHQJASON said:

A properly designed sprung under kit will net you more wheel travel than your current set-up. When we designed our spring under kit a couple years ago we cycled it with a stock shock in the stock location. With this combination we were cycling 16.5" and you should be close to if not a tiny bit more with the Fox 3.0's you have.

SDHQ Spring Under Kit



This has nothing to do with the fact that a Raptor has more horsepower than a Ranger. Driveshaft plunge can be an issue regardless of the vehicle.

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Hole Shot said:

Yes but also the direction the axle moves in a sprung under compared to sprung over is different. Your saying higher Horse power will not increase the amount of driveshaft plunge due to axle wrap??


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boarder1995 said:

Wow - great discussion guys.

Not going 4-link. Might go cantilever or might go bypass/bed mounted cage shocks. Either way, the spring under doesn't care how the longer travel shock arrangement is mounted - shock mounting does nothing to the axle/leaf/pinion path. A cantilever arrangement just allows a linkage to direct axle forces into a shock in a different orientation, with a length of travel reduction for use with standard 3.0 shocks.

Sprung under vs. over DOES affect the pinion angle, but usually for the better during acceleration as it'll prevent the differential from getting cranked up too far. And the same during hard braking, helping prevent differential drop down.

The limits of my driveshaft stroke might be bumped if the spring under can droop lower than a regular set of Deaver +3 I'm currently running. But as the sprung under arrangement already has a greater arch to it, I might be limiting to droop travel with stock shackle limiting travel more versus a slightly flatter over sprung setup.

I was mostly wondering if those with Deaver +8 notice an appreciable harsher ride versus Deaver +3 (if they had those to begin with), since usually a steeper arched spring will be harsher than a flatter spring arrangement. I'll give Deaver a call too for feedback and will report with my findings.

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boarder1995 said:

Wow - great discussion guys.

Not going 4-link. Might go cantilever or might go bypass/bed mounted cage shocks. Either way, the spring under doesn't care how the longer travel shock arrangement is mounted - shock mounting does nothing to the axle/leaf/pinion path. A cantilever arrangement just allows a linkage to direct axle forces into a shock in a different orientation, with a length of travel reduction for use with standard 3.0 shocks.

Sprung under vs. over DOES affect the pinion angle, but usually for the better during acceleration as it'll prevent the differential from getting cranked up too far. And the same during hard braking, helping prevent differential drop down.

The limits of my driveshaft stroke might be bumped if the spring under can droop lower than a regular set of Deaver +3 I'm currently running. But as the sprung under arrangement already has a greater arch to it, I might be limiting to droop travel with stock shackle limiting travel more versus a slightly flatter over sprung setup.

I was mostly wondering if those with Deaver +8 notice an appreciable harsher ride versus Deaver +3 (if they had those to begin with), since usually a steeper arched spring will be harsher than a flatter spring arrangement. I'll give Deaver a call too for feedback and will report with my findings.

Update after talking with Deaver... They don't call them +8 springs. They're referred to as Deaver sprung under for Raptors. Or something like that. They've had good feedback from customers on them. They do suggest longer rear shackles for droop allowance. Total length of arch is longer to accommodate the slightly steeper rate of arch - it's not just a more bent +3. The times I've talked with Deaver, it's been a good experience. Leaning more towards an eventual install after a bit more investigation. That's all for now.

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