Install 2 door Rubicon springs on a 2 door JL S questions

KeithF

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I have been searching the site a few days now and cant find much on this swap.
I have a ‘21 2 door anniversary 2.0 engine with tow package and springs/shocks (and Mopar lift LCA’s) from a ‘21 Rubicon with steel bumper, tow package, hard top and 3.6 etorque. Will this give me the 1.5” lift the 4 door guys get with springs from the 4 door rubicon?
Right now I dont want a large amount of lift, dont have the funds nor am I ready to do that much to my Jeep until I have more miles on it and the money to do it right.
If I end up installing these will I need spacers to get rid of the rear squat?
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rts4714

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It varies. But 1.5in seems to be the average. Hard top/steel bumper/tow gives a higher lift than rubi springs without that.
 

blnewt

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2dr Rubi springs will probably be 1/2" less lift give or take over 4dr springs (from a Rubi w/ the same configuration). I'm just guessing, but Rubi springs from the heaviest 2dr Rubi setup vs. 4dr Rubis springs from the lightest 4dr Rubi setup would probably be very similar in net lift on your 2dr.

Haven't checked this list from @AnnDee4444 in awhile, but maybe some of the 2dr Rubi springs cross over to the 4dr models depending on equipment options.
https://www.jlwranglerforums.com/fo...r-sport-s-question-though.65890/#post-1394774
 

AnnDee4444

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Haven't checked this list from @AnnDee4444 in awhile, but maybe some of the 2dr Rubi springs cross over to the 4dr models depending on equipment options.
https://www.jlwranglerforums.com/fo...r-sport-s-question-though.65890/#post-1394774
So far I haven't found any 4-door springs on 2-doors. That doesn't mean it didn't happen, just that I haven't come across where it did.

My current theory is that there is really only a slight range of spring rates for each trim level, and most of the different part numbers are for different free heights. The spring rate variations are probably just a result of not being able to easily manufacture the exact rate, with a close enough being acceptable. The spring rate targets were probably chosen by total vehicle weight, but I would bet that the un-sprung mass (axles/wheels/tires) was also a factor.

Per this, this, and my guesses:

SpringFront Rate #/in.Rear Rate #/in.
JLU Sport114-121171-174
JLU SaharaSport with taller free height?Sport with taller free height?
JLU Rubicon123-128172-176
Mopar 2" Lift (probably 3.6)131-133180-182
Diesel, 392, 4xemore than Sport, Rubiconmore than Sport, Rubicon
2-Doorless than equivalent JLUless than equivalent JLU
 
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KeithF

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These are the springs I have, they came off a 21 rubicon 2 door with steel front bumper, hardtop and tow package. Also had the V6 with e torque.
Can you tell which are left and right by the numbers?

D2C1CD34-87CA-4451-863C-723B2D09D7F5.jpeg


F823B82B-8E81-406A-8911-528EF9388FD6.jpeg


6F19D875-9F88-4945-B9E7-94E8FC4FB29A.jpeg
 

AnnDee4444

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but the rear springs from the Rubicon are both odd numbers... 68249111AA and 68249113AA
So far, the larger number always goes on the passenger side.
 

Paul19JLR

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Both those numbers show rear spring left right. I would assume the taller of the two would be the right to offset the fuel lean.
 
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KeithF

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I just measured the springs and the higher numerical springs are longer by about 3/8”. I used 2 framing squares to make a crude set of calipers.
 
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KeithF

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I haven't installed the Rubicon pieces yet, waiting to get more miles on my Jeep first. The Anniversary model is advertised as "heavy duty suspension" so I wrote the spring numbers down that are installed now as original. Dont know if this means anything to you guys, (and I double checked the tags on the front springs). Spring wire diameter's run 13.5 to 14mm on all springs with the variance running the length of the springs.

2door Anniversary hard top, tow package, 2.0 turbo.
LF 6825 0236AD
RF 6825 0228AD
LR 6824 9109AA
RR 6824 9110AA

2 door Rubicon take-offs: Hard top, tow package, steel bumpers 3.6 etorque
LF 6825 0229AD
RF 6825 0230AD
LR 6824 9111AA
RR 6824 9113AA

I only want 1.5 to 2.0" lift, do you think this will get me there? I know your charts dont have much info on the 2 door.
 
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