Carli and Thuren’s Gen 5 approaches

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JamesgPW

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I’m not so much interested in hearing peoples opinions about suspension is better in terms of ride quality. I want to discuss the technical differences between the two approaches so I can better understand why they are so different. From what I have gathered, their approaches are as follows for the 19+ Power Wagon:

Thuren’s approach is slightly stiffer +0.5” or +1.5” front coils, ~OEM height softer rear coils, front adjustable track bar, rear non adjustable track bar and relocation bracket, rear sway bar links, and tuned shocks (2.0, 2.5, and 3.0).

Carli’s approach is slightly softer +2” front coils, slightly stiffer +1” rear coils, front adjustable track bar, rear OEM track bar drop bracket, rear sway bar links, front and rear bump stop drops, OEM radius arm 2” drop brackets, and tuned shocks (2.0, 2.5, 3.0).

Why does Carli specify the need to drop the radius arms and bump stops while Thuren says at just 0.5” less front lift the radius are caster is fine and bump stop drops are not needed.

How far back do the Thuren 1.5” coils pull the front axle caster? Has anyone run Thuren 1.5” front coils and then used Synergy or Carli radius arm drop brackets to center the caster?
 

olyelr

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I am no engineer, but it seems to me that if the factory caster adjuster bolts have enough adjustment to get back to proper caster with the 1.5” springs (which they do), then isnt that enough?

I am not sure why gaining the caster back using control arm drops would be any better. Certainly would be more of a detriment in off road scenarios…not horribly worse by any means, but not a step in the right direction.
 

Stuffpower

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I don’t believe you can adjust caster on our trucks??? And the drop brackets are geometry
 

SeppW

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My guess is has to do with the manner of how an axle on a control arm behaves as opposed to leaf spring set up. Not clear to me why Carli uses control arm drop brackets other than what what they assert about spring bowing and full adjustment of caster eccentrics.

I have a Thuen 1.5 kit and I left the caster eccentrics on factory settings, but did set toe to zero. No issues thus far (kits been on 5 years), the front axle pinion angle and drive shaft are horizontal, or close to it, and track bar and drag link are parallel. One note though, Thuren claims his springs, or did, will not bow. I do have a slight bow in one of the springs, but as he notes the Power Wagon (or plain 2500) platform has a very tricky front suspension set up, spring buckets are in an unusual position on the axle, and the control arm "articulink" function.
 

Adventurebound

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This brings up a good question as the main difference in these kits is the replacement lower radius arms drop brackets and how that might correct the pinion angle.

I have the Thuren "kit" and I have noticed my front driveshaft CV joint is failing (yes Ram used a CV joint at the transfer case end...worst design ever). This is fairly common when lifting HD Rams im learning.

What I'm wondering Is would the drop brackets correct the front pinion angle, thus alleviating the angle of thr rear CV?
 

olyelr

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This brings up a good question as the main difference in these kits is the replacement lower radius arms drop brackets and how that might correct the pinion angle.

I have the Thuren "kit" and I have noticed my front driveshaft CV joint is failing (yes Ram used a CV joint at the transfer case end...worst design ever). This is fairly common when lifting HD Rams im learning.

What I'm wondering Is would the drop brackets correct the front pinion angle, thus alleviating the angle of thr rear CV?
No it would make it worse.
 

Travelin Ram

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Like most decisions, compromise is involved.

Having radius arms horizontal provides a better geometry and ride quality because no forward motion of the front axle is required to travel up.

The compromise is reduced clearance where the drop brackets hang down.
 
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