Rubicon vs sport suspension height?

[blnewt]

2.0?

3.6 w/ 8AT

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[Odyssey USA]

Thanks for posting these. Without the winch, I think the front of mine may have even been higher. It felt like the shocks were getting fully extended and topping out more often.

Since the front Rubicon shocks are 23.625" extended, a 21.5" ride height would only leave a little more than 2" of droop.

Still learning “Jeep” so how much would be ideal? Do you need longer shocks?

 

[AnnDee4444]

Yeah, all OEM 2-door Rubicon. There is another JLR on the list that also has the 114/115 rear springs (3rd from the top). I just double checked and noticed that the spring numbers don't follow the same "68253_ _ _ " format. I've asked Benny with Allmoparparts to confirm the numbers I am reading are accurate.

Below is all the part numbers Benny provided. They are all a different "68_ _ _" number than I have seen posted. More variables... awesome. /s

LF 68250232AB
RF 68250233AB
LR 68249114AA
RR 68249115AA​

Still learning “Jeep” so how much would be ideal? Do you need longer shocks?

I'm trying to figure it all out too. The chart below should help. If I haven't mentioned this earlier, don't take everything I post as 100% absolutely correct. These charts are just my method of creating some order to the information posted on this forum & other websites.

One thing I still don't quite understand is bump stops (or at least the advice given about them). A 35" tire fits on a Rubicon with no modifications, yet a 37" tire needs 2" of additional bump stop? Shouldn't it only need 1" extra? Are the available shock lengths what is dictating the bump stops being used?

 

[AnnDee4444]

My JLR 2.0 with steel bumper (and Warn Zeon), with hardtop, without tow package:
Front shock length installed: 20" eye-to-eye
Rear shock length installed: 22.5" eye-to-eye

One more thing: the front shock motion ratio is 1:1, meaning that for every 1" the shock moves, the axle moves 1" as well. The rear shock is angled rearwards, so the ratio is not 1:1, and the shock will need to move something like 1.25" for every 1" of suspension travel. I don't know the actual ratio, so don't assume it's 1.25:1.

 

[iki4life]

I just got the Rubicon takeoffs and LCAs + 1/2 inch teraflex spacers,a with 315/70/r17 patagonias and icon rebounds.

 

[Odyssey USA]

I just got the Rubicon takeoffs and LCAs + 1/2 inch teraflex spacers,a with 315/70/r17 patagonias and icon rebounds.

What did you do for the tailgate/carrier?

 

[Jeeper123]

Okay, more research results to confirm the rubicon springs are different and taller:

Sport spring part numbers:
Rear Passenger 68253589AA
Rear Driver 68253588AA
Front Driver 68253657AB
Front Passenger 68253658AB

Rubicon spring part numbers:
Rear Passenger 68253591AA
Rear Driver 68253590AA
Front Driver 68253659AB
Front Passenger 68253660AB


What I haven’t found yet are any specs on each springs capacities.

 

[Jeeper123]

Thanks for putting in the research. Do you know if 2019 or 2020 jlur suspension takeoffs would work on a 2018 jlu sport? Looking for a mild lift. Thanks in advance.

 

[blnewt]

Thanks for putting in the research. Do you know if 2019 or 2020 jlur suspension takeoffs would work on a 2018 jlu sport? Looking for a mild lift. Thanks in advance.

Yes, they will work fine, try to find a Rubicon that has hardtop, tow pkg, and steel bumpers, these have the longest springs. But even the shortest Rubicon sets should still get you a lift in the 1.5" range.

 

[Odyssey USA]

Thanks for putting in the research. Do you know if 2019 or 2020 jlur suspension takeoffs would work on a 2018 jlu sport? Looking for a mild lift. Thanks in advance.

They’re interchangeable.

 

[Jeeper123]

Yes, they will work fine, try to find a Rubicon that has hardtop, tow pkg, and steel bumpers, these have the longest springs. But even the shortest Rubicon sets should still get you a lift in the 1.5" range.

Good deal. Thanks again!

 

[Jeeper123]

They’re interchangeable.

Right on! Thanks again, this helps.

 

[iki4life]

What did you do for the tailgate/carrier?

Nothing it's stock. I don't know if I need to do anything

 

[Odyssey USA]

Nothing it's stock. I don't know if I need to do anything

Hmm. I thought you might need a larger carrier or at least check for the two rubber bumpers applying pressure on the bottom left and right off your spare. It seems certain wheels’ offsets can make them no longer touch letting the spare bounce around.

 

[AnnDee4444]

One more thing: the front shock motion ratio is 1:1, meaning that for every 1" the shock moves, the axle moves 1" as well. The rear shock is angled rearwards, so the ratio is not 1:1, and the shock will need to move something like 1.25" for every 1" of suspension travel. I don't know the actual ratio, so don't assume it's 1.25:1.

I had the above wording exactly backwards. The rear shock moves less than the axle. A stock Rubicon could have up to about 10" of rear suspension travel, while the rear shock only has a stroke of 8.5".

You can do this calculation with the pythagorean theorem (a²+b²=c²)

a² = horizontal distance between upper shock mounting point & axle (about 11")
b² = vertical distance between upper shock mounting point & axle (unknown)
c² = shock length​

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