Mopar LCA swap

[Jtphoto]

All you have done is put a high spring rate coils in your Jeep which means the Jeep that it came off was heavier than yours nothing more. This has been common practice since the JK world as well. In which case you should be adding all the other 2” lift stuff that a 2” lift kit would give you.

If you look at the Mopar parts website. Their 2” lifts are listed by 2dr or 4dr, and by what engine size you have. Not by model. This is the first clue Rubicons are not lifted.
I could do the same with my XR and put 392 or Diesel coils in. It doesn’t make it right.

Sponsored

 

[stumblinhorse]

To add to the confusion. And agree with @Jtphoto. The XR package adds ~1.5” to any JL, except the 392. The XR package adds no lift to a 392.

 

[Speed331]

Rubicon vs sport s shock

 

[Jtphoto]

Rubicon vs sport s shock

Yes there is no argument that Rubicon shocks are longer for more flex, especially the front, because of the disconnects. They always have been even in the JKs. That means nothing for ride height.

 

[txj2go]

My stock 2dr sport with rubicon springs lifted approx 2", that's the only fact that I've dealt with personally.

My JLU Sport with Rubicon springs gained 1.5" front and 2" rear over its stock springs, the springs came from a similarly equipped Rubicon so in my case the springs weren't from a heavier vehicle.

This is not a strictly apples to apples comparison since the Rubicon has different axles. The spring perches and shock mounts may be attached differently. (If the spring perches and shock attachments are at different points on the Rubicon axles then it would make sense for them to put the LCA mount at a different point to maintain caster.) With the fenders being different from one model to another it is harder to determine a common point to measure from. It was easy for me I just measured before and remembered where I took the measurement, then measured after the same way. If we could establish easily described points to measure from we could probably have different members here take these measurements on stock vehicles and report.

 

[unsavory]

My JLU Sport with Rubicon springs gained 1.5" front and 2" rear over its stock springs, the springs came from a similarly equipped Rubicon so in my case the springs weren't from a heavier vehicle.

This is not a strictly apples to apples comparison since the Rubicon has different axles. The spring perches and shock mounts may be attached differently. (If the spring perches and shock attachments are at different points on the Rubicon axles then it would make sense for them to put the LCA mount at a different point to maintain caster.) With the fenders being different from one model to another it is harder to determine a common point to measure from. It was easy for me I just measured before and remembered where I took the measurement, then measured after the same way. If we could establish easily described points to measure from we could probably have different members here take these measurements on stock vehicles and report.

There is already plenty of common points to measure in the many threads on this forum regarding height difference between models.

The most common is either shock center eye to center eye bolt length, or top of axle tube to bottom lip of upper spring perch.

Edit: Just noticed @Jtphoto posted the diagram showing where to measure, a few posts up.

 

[txj2go]

There is already plenty of common points to measure in the many threads on this forum regarding height difference between models.

I was thinking more in terms of measuring from the body to the ground. Measuring spring perches and so forth assumes that those parts are installed identically on the different axle types.
But yes maybe all of this has been answered already in other threads and I'm not aware of it.

 

[blnewt]

As far as caster from the factory, there's been many members w/ Rubicons that have been in the low 4 range, and haven't read of any sports that have been under the 5 range FWIW.

 

[Jtphoto]

My JLU Sport with Rubicon springs gained 1.5" front and 2" rear over its stock springs, the springs came from a similarly equipped Rubicon so in my case the springs weren't from a heavier vehicle.

This is not a strictly apples to apples comparison since the Rubicon has different axles. The spring perches and shock mounts may be attached differently. (If the spring perches and shock attachments are at different points on the Rubicon axles then it would make sense for them to put the LCA mount at a different point to maintain caster.) With the fenders being different from one model to another it is harder to determine a common point to measure from. It was easy for me I just measured before and remembered where I took the measurement, then measured after the same way. If we could establish easily described points to measure from we could probably have different members here take these measurements on stock vehicles and report.

I posted a diagram and measurements I got from new vehicles on the lot. The only difference on the Rubicon front axle are tubes and axle shafts are longer and center section is bigger all the rest is the same.

 

[Jtphoto]

I was thinking more in terms of measuring from the body to the ground. Measuring spring perches and so forth assumes that those parts are installed identically on the different axle types.
But yes maybe all of this has been answered already in other threads and I'm not aware of it.

You can’t depend on body to ground. All models have different size and type tires and if the psi in the tires is not consistent then that throws your measurements off as well.

 

[txj2go]

I posted a diagram and measurements I got from new vehicles on the lot. The only difference on the Rubicon front axle are tubes and axle shafts are longer and center section is bigger all the rest is the same.

If that is the case then Rubicons should be taller than Sports by a good amount. Take a JLU Rubicon V6 automatic, everything above the axles should weigh about the same as a JLU Sport V6 automatic. Take springs off of the Rubicon, put on the Sport, the sport is raised an average of 1.75", therefore the Rubicon should have started 1.75" higher. If this is not showing up in actual measurements then there is something else under the vehicle that is different.
Per the measurements on the sides of the tires, I believe a Rubicon would gain 0.75" over a Sport based on different tires. (I didn't do the calculation for a Sahara or Willys) So that is a total of 2.5". Therefore crawl under it and measure from frame to ground and you should see 2.5" difference. Is this not showing up in actual measurements?

 

[hoag4147]

If you look at the Mopar parts website. Their 2” lifts are listed by 2dr or 4dr, and by what engine size you have. Not by model. This is the first clue Rubicons are not lifted.

Sorry. Have to disagree. Mopar and 99% of all lifts base their lift amounts on Rubicons. Most mopar lifts on Rubicons see 2-2.5” of lift and all other JLUs see near 4”s of lift. Rubicons are definitely lifted compared to Sports/Saharas range from 1-1.5” which is why caster is on low end of spec range for Rubicons.

 

[Jtphoto]

Sorry. Have to disagree. Mopar and 99% of all lifts base their lift amounts on Rubicons. Most mopar lifts on Rubicons see 2-2.5” of lift and all other JLUs see near 4”s of lift. Rubicons are definitely lifted compared to Sports/Saharas range from 1-1.5” which is why caster is on low end of spec range for Rubicons.

That’s BS. Snake Oil. If my XR has a 1.5” lift it would mean it should be 3.5 to 4” taller then a Sport. Lol NOT, it’s not even 2” taller then a sport. The springs are the ONLY THING that lifts a Wrangler PERIOD. A 3” spring on a Wrangler is a 3” spring period it doesn’t matter what model it’s on, it lifts them all the same. An Rubi XR has a 1.5” lift over any other model nothing more. There are no dedicated Rubi springs other then the XR. all the Rubi has is taller tires and a bit stiffer not taller springs. Yes you can get away with a shorter spring on the Rubi because it has high line fenders. Go measure a stock Rubi. I have.

 

[blnewt]

That’s BS. The springs are the ONLY THING that lifts a Wrangler PERIOD. A 3” spring on a Wrangler is a 3” spring period it doesn’t matter what model it’s on, it lifts them all the same. An Rubi XR has a 1.5” lift over any other model nothing more. all the Rubi has is taller tires and a bit stiffer no taller springs.

I don't have the pics but I know for a fact my Rubi set was taller.

 

[hoag4147]

That’s BS. The springs are the ONLY THING that lifts a Wrangler PERIOD. A 3” spring on a Wrangler is a 3” spring period it doesn’t matter what model it’s on, it lifts them all the same. An Rubi XR has a 1.5” lift over any other model nothing more. all the Rubi has is taller tires and a bit stiffer no taller springs.

There’s tons of threads on here showing the springs and shocks from Rubi are longer then all other models. I can personally tell you my Sport S lifted almost 4”s with the Mopar 2” lift springs.

Sponsored