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Old 10-01-2016, 04:50 AM
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RK 2.5'' or 3.5'' x-factor for my JKU?

Hi guys, I have a 2016 JKU Rubicon, everything is stock now. I am considering putting on the RK x-factor system with Rancho 9000 shocks. But couldn't decide whether I should buy the 2.5'' or the 3.5'' one. I probably will end up with 35 tires but no bigger so I don't have a strong reason for going 3.5'' lift. But, hey, for the same amount of money (their prices are pretty much the same), who don't want to go taller? So my concern is, is the RK x-factor system complete enough even for a 3.5'' lift? Do I need to worry about anything else?

Also, I am quite confused that why the length of springs are always 1'' shorter than the lift itself (like, RK 2.5'' x-factor only comes with 1.5'' springs and 3.5'' comes with 2.5'' springs)?

Thanks in advance!

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Old 10-01-2016, 05:30 AM   #2
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Quote:
Originally Posted by dxynnez View Post
Hi guys, I have a 2016 JKU Rubicon, everything is stock now. I am considering putting on the RK x-factor system with Rancho 9000 shocks. But couldn't decide whether I should buy the 2.5'' or the 3.5'' one. I probably will end up with 35 tires but no bigger so I don't have a strong reason for going 3.5'' lift. But, hey, for the same amount of money (their prices are pretty much the same), who don't want to go taller? So my concern is, is the RK x-factor system complete enough even for a 3.5'' lift? Do I need to worry about anything else? Also, I am quite confused that why the length of springs are always 1'' shorter than the lift itself (like, RK 2.5'' x-factor only comes with 1.5'' springs and 3.5'' comes with 2.5'' springs)? Thanks in advance!
No The coils now are 2/4 door specific. 2.5 is 2.5 and 3.5 is 3.5 for a 4 door. Running 3.5" or more imo benefits with a drag link flip kit. Correcting the steering angles fixed the geometry and limits bumpsteer.

Tire size ? Type of wheeling trail or rock crawling ?
You want to try and match lift with tire size.

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Old 10-01-2016, 12:17 PM
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No The coils now are 2/4 door specific. 2.5 is 2.5 and 3.5 is 3.5 for a 4 door. Running 3.5" or more imo benefits with a drag link flip kit. Correcting the steering angles fixed the geometry and limits bumpsteer.

Tire size ? Type of wheeling trail or rock crawling ?
You want to try and match lift with tire size.
Emmmmm.. Are you sure? On Northridge4x4 it didn't ask me whether it's a 2D or 4D. So I should just get the 3.5 lift kit since it has 2.5 coil springs?

I will just run the stock Rubicon tires for now. Have to save more time to run bigger tires, but won't bigger than 35'' I guess. It's my daily drive and I will do occasionally off-roading but no rock crawling I guess.
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Old 10-01-2016, 01:33 PM   #4
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3.5 will help with break over angle on a JKU. Remember that the advertised light height assumes a fully equip'd and armored Jeep, i.e. bumpers, winch, armor. Lift height will be higher without this stuff. It sounds like 2.5 will fill you needs.
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Old 10-01-2016, 01:39 PM   #5
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Originally Posted by dxynnez View Post
Emmmmm.. Are you sure? On Northridge4x4 it didn't ask me whether it's a 2D or 4D. So I should just get the 3.5 lift kit since it has 2.5 coil springs? I will just run the stock Rubicon tires for now. Have to save more time to run bigger tires, but won't bigger than 35'' I guess. It's my daily drive and I will do occasionally off-roading but no rock crawling I guess.
Then the 2.5's will work just fine. Not sure why NR doesn't ask 2/4 door.

What shocks are you looking at ? FYI Ranchos been running their buy 3 get 1 free rebate deal.
Rancho 9000 or 5000x part # ending in 29/30 for 2.5"
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Old 10-01-2016, 01:40 PM   #6
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Actually look at the code on the bottom, it says "2kit" assuming that means 2 door. I could be wrong so call or message them.

Edit: i looked again and it specifies unlimited twice. I was wrong lol
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Old 10-01-2016, 03:33 PM
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3.5 will help with break over angle on a JKU. Remember that the advertised light height assumes a fully equip'd and armored Jeep, i.e. bumpers, winch, armor. Lift height will be higher without this stuff. It sounds like 2.5 will fill you needs.
Ya, but eventually I will replace the stock bumpers and probably put a winch too. Just want to do the lift once and do it right..
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Old 10-01-2016, 03:37 PM
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Then the 2.5's will work just fine. Not sure why NR doesn't ask 2/4 door.

What shocks are you looking at ? FYI Ranchos been running their buy 3 get 1 free rebate deal.
Rancho 9000 or 5000x part # ending in 29/30 for 2.5"
Going to get Rancho 9000. You just remind me about another weird part.. On NR website, the RK 2.5'' x-factor package comes with 30/31, it doesn't make sense why it has only 1.5'' coils. I think my best bet is to call them.
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Old 10-01-2016, 04:11 PM   #9
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Going to get Rancho 9000. You just remind me about another weird part.. On NR website, the RK 2.5'' x-factor package comes with 30/31, it doesn't make sense why it has only 1.5'' coils. I think my best bet is to call them.
1.5's?

The 31's are longer up front but work well with 2.5 and 2-3" bump stop. 29's or 31's will work.
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Old 10-02-2016, 08:53 PM   #10
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I have the 3.5 RK midFlex kit on mine with 35s. I am also running the longer 5100s for shocks. It rides amazingly and the handles the woods and trails like a dream. I haven't done a draglink flip yet but it really doesn't ride like it needs it. The 3.5 lift yielded a little over 4 inches and tires 2 inches so needless to say it made a huge difference.


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