Confirmed: Rubicon Front Springs 340/ 343 are 1" Taller than Sport S Max Tow

[Aonarch]

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[TTU03]

Would these springs be a better solution then a one inch spacer to lift just the front in regard to leveling the truck a bit?

 

[Aonarch]

Would these springs be a better solution then a one inch spacer to lift just the front in regard to leveling the truck a bit?

Absolutely.

 

[oldskool]

And Mohave should be 1" taller than Rubicon.

 

[DocMike]

I'd wonder what the spring rates are. I know when I went from the Sport S spring to the Rubicon, they were about the same height, but the Rubicon gave me a 1 inch lift all around. The coils were thicker.

The Max Tow appears to have 8 coils vs the Rubicon 7. I'm not a mathemagenuis. So I'll wait for one of the people on here that know.

 

[Pitch]

What spring goes on what side? Is the 340 passenger or driver? Thanks

 

[JRobes]

just so everyone's aware, the unsprung length difference doesn't necessarily mean that's how much lift it'll give. If the rubicon springs are softer (lower spring rate), they'll compress more once on the vehicle and the vehicle weight is compressing it.

 

[Aonarch]

What spring goes on what side? Is the 340 passenger or driver? Thanks

340 is driver

 

[Aonarch]

just so everyone's aware, the unsprung length difference doesn't necessarily mean that's how much lift it'll give. If the rubicon springs are softer (lower spring rate), they'll compress more once on the vehicle and the vehicle weight is compressing it.

Correct. However, these have higher spring rates and are taller than the Sport S springs.

EDIT: I just remeasured, I gained 1 1/4" over the Sport S front springs.

 

[ShadowsPapa]

Don't over-simplify springs. Max Tow rears were SHORTER than the stock Overland by quite a bit, If I recall correctly, a good 3/4 to 1" shorter and yet with the weight of my truck on them, it sat pretty much the same.

Because a spring is 1" longer doesn't guarantee 1" "lift". Maybe - but rates, etc. matter, not length.
Always could be more, could be less. Since the Rubicon is heavier in most cases, then expect more, but length is only part of it as discovered here.

(higher numbered spring always to the right or passenger side)

There's another "bottom line" here - A Sport max tow may be fully equipped and get heavier springs than the truck in this post. The Rubicon springs COULD have come from a lighter Rubicon.
I've said this before - "Rubicon springs" is a trick statement. There are several numbers for Rubicon depending on how optioned the truck is. Same for Sport max tow or not. There will be different numbers depending on the truck's equipment.
So you can not say with certainty that "Rubicon springs are 1" longer than max tow".
SOME will be, maybe most are - but that's generalizing and saying all Rubicons are the same and all Sport with max tow are the same. If the fronts came from a Rubicon with the stock plastic bumper and minus other options, it would have lighter springs.
In this case he got the heavier Rubicon springs.
The set I got was 339 and 340 so the 340 goes on the PASSENGER side for me.
(so don't use the 340 on the driver side as a rule!)

Every level of JT uses multiple spring numbers.

The Max Tow appears to have 8 coils vs the Rubicon 7. I'm not a mathemagenuis. So I'll wait for one of the people on here that know.

And the two Rubicon rears I have have different numbers of coils! One has more than the other.
These are all from Rubicon - but look at the number of coils in the left or shorter spring compared to the coils in the taller right spring.
All of these are from the SAME Rubicon - fronts on the left, rears on the right.

 

[Pitch]

340 is driver

Thanks!

 

[Aonarch]

Don't over-simplify springs. Max Tow rears were SHORTER than the stock Overland by quite a bit, If I recall correctly, a good 3/4 to 1" shorter and yet with the weight of my truck on them, it sat pretty much the same.

Because a spring is 1" longer doesn't guarantee 1" "lift". Maybe - but rates, etc. matter, not length.
Always could be more, could be less. Since the Rubicon is heavier in most cases, then expect more, but length is only part of it as discovered here.

(higher numbered spring always to the right or passenger side)

There's another "bottom line" here - A Sport max tow may be fully equipped and get heavier springs than the truck in this post. The Rubicon springs COULD have come from a lighter Rubicon.
I've said this before - "Rubicon springs" is a trick statement. There are several numbers for Rubicon depending on how optioned the truck is. Same for Sport max tow or not. There will be different numbers depending on the truck's equipment.
So you can not say with certainty that "Rubicon springs are 1" longer than max tow".
SOME will be, maybe most are - but that's generalizing and saying all Rubicons are the same and all Sport with max tow are the same. If the fronts came from a Rubicon with the stock plastic bumper and minus other options, it would have lighter springs.
In this case he got the heavier Rubicon springs.
The set I got was 339 and 340 so the 340 goes on the PASSENGER side for me.
(so don't use the 340 on the driver side as a rule!)

Every level of JT uses multiple spring numbers.



And the two Rubicon rears I have have different numbers of coils! One has more than the other.
These are all from Rubicon - but look at the number of coils in the left or shorter spring compared to the coils in the taller right spring.
All of these are from the SAME Rubicon - fronts on the left, rears on the right.

Thanks for the reply. I agree with what you've said.

I will say my thread title is pretty specific and all of the info that I've offered clearly states what vehicle and what part numbers.

So as always YRMV

 

[ShadowsPapa]

Thanks for the reply. I agree with what you've said.

I will say my thread title is pretty specific and all of the info that I've offered clearly states what vehicle and what part numbers.

So as always YRMV

Might help if you included your original spring numbers - unless you did and I missed those, of so, sorry.

The specific Rubicon numbers will help for sure.

I got an inch on the Rubicon springs I used - slightly lighter than the ones you used so it makes sense that you gained a bit more. My truck MAY BE heavier than yours - MAYBE, depending on your options. (have to be careful comparing the curb weight of the trucks, too, as that includes wheels and axles and differentials and all that so a Max Tow Sport will have wider wheel base - likely the front and rear differentials (or axle assemblies) will be a bit heavier)
Pretty hard to compare only sprung weight, though!

 

[rickrogan]

FWIW: I have a Rubicon 3.6 which came from factory w/ the plastic bumper. It has 339/340 on the front. (This is consistent with the above comment from @ShadowsPapa

If anyone has info on the front coil spring part numbers for a 2020 Rubicon 3.6 automatic that came from the factory with the STEEL bumper, I would be appreciative. (My dealer's parts guy can't figure anything out w/o last-8 of a VIN.)

 

[Aonarch]

FWIW: I have a Rubicon 3.6 which came from factory w/ the plastic bumper. It has 339/340 on the front. (This is consistent with the above comment from @ShadowsPapa

If anyone has info on the front coil spring part numbers for a 2020 Rubicon 3.6 automatic that came from the factory with the STEEL bumper, I would be appreciative. (My dealer's parts guy can't figure anything out w/o last-8 of a VIN.)

1C6JJTBG1LL117934


https://carscoms.com/2020-jeep-gladiator-rubicon-launch-edition-346919.html

LE Vin with steel bumpers and hardtop. Try that.

EDIT: This is second hand knowledge but user "Mac" bought LE takeoffs and the front springs were 340/343. I messaged him about this and he confirmed.

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