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2015+ 3500 SRW air ride - what are your rear spring packs like?

johnmyster

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I'm toying with the idea of changing the rear suspension on my truck (again) in pursuit of ride quality. See signature. Presently the rear is Carli mini-packs on stock springs. Ride is good when towing our camper but pretty harsh unloaded. I'm sure softer shocks would help, but work against me with the TT hitched. From what I can tell the front axle is doing its job but the truck is severely imbalanced. Knowing what I know now I would shop harder for a megacab 3500 air assist or 2500 coil and add airbags.

If I'm looking at Thuren/Carli's softer spring packs, I'll also need airbags I assume. Last scaled RAW is 5900, but that was before bed cover, rack kayaks, extra firewood, extra child, etc.

If I'm adding the complexity of airbags (on board air, controller, etc) why not hunt down a set of rear springs from a 3500 air assist truck and then use an aftermarket bolt-on airbag fitment (since my frame/axle don't have the airbag perches). Looking at part numbers, I've found 68280127, 68349438, and 68273634. I'm assuming that the springs are dimensionally the same, eye-eye and width.

68280127 strangely can be had for about $520 a pair, delivered, but looks like an odd setup with asymmetric progressives on the bottom. So my question, for the 2015+ 3500 SRW air assist trucks, are the packs asymmetric or symmetric. See photos. All insight appreciated.

(EDIT: adding part number 68273634AA for completeness.)

68280127:
1763839384886.png

68349438:
1763839521366.png
 
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2015-2016 auto level had asymmetric leaves not pictured, closest to the 68280127 but nothing for overloads aft of the axle.

2017-current SRW and 2017-2024 DRW (pretty sure thru 2024 DRW) use 68280127.

2025 - current DRW (again, fairly certain the DRW change happened in 2025) use 68349438.

Can’t confirm exact part numbers, just spring pack appearances.
 
2015-2016 auto level had asymmetric leaves not pictured, closest to the 68280127 but nothing for overloads aft of the axle.

2017-current SRW and 2017-2024 DRW (pretty sure thru 2024 DRW) use 68280127.

2025 - current DRW (again, fairly certain the DRW change happened in 2025) use 68349438.

Can’t confirm exact part numbers, just spring pack appearances.
Interesting, thanks. Does that extra lower half leaf point to the front or the rear?

Am I on the right track thinking they would bolt into my truck? (Non air assist uses same leaf packs, based on configuration, across all years.) Same length and width?
 
Interesting, thanks. Does that extra lower half leaf point to the front or the rear?

Am I on the right track thinking they would bolt into my truck? (Non air assist uses same leaf packs, based on configuration, across all years.) Same length and width?

The double overload is forward and the single overload is aft. I believe it’s part weight support and part axle wrap control.

I believe they are the same length and width and utilize the same frame/mounts but I haven’t verified it.

It would be kinda cool to have the auto-level leaves with manual control of airbag pressures. I really liked my auto-level 3500’s.
 
Thanks for the input. The 68280127 spring lists for 2016/2018 trucks in the catalog I'm looking at. (In which case I've posted in wrong forum.) I'm not sure what (probably minor) variation might have been made for 2019 up. I'll try to tape measure the length/width dimensions on my truck and maybe someone with corresponding air ride configurations can do the same.

Not that I need another project, but for $520 plus air bags plus onboard air, plus controller...

FWIW:
68349438 appears to list for 2019/2020.
68273634 also for 2016/2018, but the diagrams show it as a mono-leaf which is fishy. (I thought the mono-leaf hotchkiss setup was discontinued after 2015.)
 
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I don’t think the mono leaf ever made it to production.
 
Interesting. Thanks for the insight.


Strange however that the part number seems to exist, show in-stock with a price, shows up in the diagrams, etc. If it's the part that actually replaced the mono leaf then it's something different.

Strange that two different springs show up for the 2015-2018 range. DRW vs SRW? SRW had the extra half leaf?

EDIT: And here's an aftermarket that lists for 2014-2015 and is a one-sided lower/overload.

 
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2015 was the first year of the 3500 auto-level.

2015-2016 trucks had the one sided overload.
 
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