Why does RC 4inch lift require no Drive Shaft mods? - JeepForum.com
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post #1 of 25 Old 07-22-2010, 11:47 PM Thread Starter
nismosis
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Why does RC 4inch lift require no Drive Shaft mods?

I keep hearing that lifting a 2dr jk more than 2.5 inches will require driveshaft mods. I have a rough country 4 inch on the way, and I have been told it is bolt on with no additional mods required. Why is this? Is it just during heavy wheeling that this becomes an issue?

thanks

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post #2 of 25 Old 07-23-2010, 12:12 AM
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Sorry, it was late, and I was in the wrong section... it didn't even occur to me that this was a JK.

My bad. Thanks for pointing it out.

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Last edited by R0cket; 07-23-2010 at 12:06 PM.
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post #3 of 25 Old 07-23-2010, 01:29 AM
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never heard of using a SYE on a JK

Some people have been able to buy upper adjustable control arms to fix the pinion angle so the boot doesnt rip and fling all the grease out. That would be the cheapest fix and if you need aftermarket CV driveshafts in the future then you would be good to go.

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post #4 of 25 Old 07-23-2010, 01:29 AM
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Originally Posted by R0cket View Post
if i were you i'd get the SYE.
That is for the TJs only. The JKs done away with that set-up.


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post #5 of 25 Old 07-23-2010, 01:39 AM
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Originally Posted by R0cket View Post
the issue is driveshaft angle....... you SHOULD use either a coil angle adjuster bracket, or get a tcase drop bracket. not REQUIRED, but as per RC it is recommended. it's all for preventing driveline vibrations..

if i were you i'd get the SYE. i have a RC 6" long arm kit and have the SYE and it's definitely worth the $$

unless you have a rubicon.... then you don't have a slip yoke... so you don't need to worry about it
Please dont come in the JK section and give advice on how stuff would work on a TJ, that is a good way to confuse newbs and start rumors.... Thanks for trying though.

I run the RC 4" and have not had any problems whatsoever with driveline vibes or any kind of driveshaft problems whatsoever... Do you have an auto or a standard?
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post #6 of 25 Old 07-23-2010, 03:53 AM
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Originally Posted by 1222 View Post
That is for the TJs only. The JKs done away with that set-up.
I dont suggest things out of my realm, but I didnt know this.

Hooray.
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post #7 of 25 Old 07-23-2010, 04:06 AM
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I dont suggest things out of my realm, but I didnt know this.

Hooray.
Good thing to know huh
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post #8 of 25 Old 07-23-2010, 04:13 AM
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Yeah buddy!
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post #9 of 25 Old 07-23-2010, 12:02 PM
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Sorry guys. I was in the wrong section. My apologies.

Ian
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post #10 of 25 Old 07-23-2010, 01:42 PM
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Sorry guys. I was in the wrong section. My apologies.
Its all good... Just trying to cut down on the confusion here.
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post #11 of 25 Old 07-23-2010, 02:55 PM Thread Starter
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Soooo, will i have issues or no? a little confuesed, lol
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post #12 of 25 Old 07-23-2010, 03:01 PM
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Soooo, will i have issues or no? a little confuesed, lol
... No... if you have a standard tranny...
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post #13 of 25 Old 07-23-2010, 08:28 PM
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Soooo, will i have issues or no? a little confuesed, lol
you're welcome.

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post #14 of 25 Old 07-23-2010, 10:43 PM
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Pushing 12K on my RC 4" lift w/ Auto Trans. No issues!
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post #15 of 25 Old 07-23-2010, 11:56 PM
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Quote:
Originally Posted by nismosis View Post
I keep hearing that lifting a 2dr jk more than 2.5 inches will require driveshaft mods. I have a rough country 4 inch on the way, and I have been told it is bolt on with no additional mods required. Why is this? Is it just during heavy wheeling that this becomes an issue?

thanks
You were sold a kit by someone who doesn't know what they are talking about. RC kind of has a reputation for that. They do have some reps who actually drive jeeps, but most of them don't.

Until a couple months ago, they sold 1.25" body lifts to guys with 6 speeds when they knew it would cause problems--now they clearly state they are not for 6 speeds.

Until a few months ago, they sold 4" and 6" short arm lifts with fixed length control arms that they knew would not allow for proper suspension tuning.

Even now, RC sells a 6" short arm kit that they know will drive poorly and that most buyers will end up replacing.

Don't get me wrong, RC has some competitively priced stuff that, when properly supplemented, is a good deal. But, you will not get the correct answer from an inside sales rep who answers phones, doesn't even own a jeep, and has never done an install on a JK.


The rear driveshaft is short enough that with lifts at about 3"+ the rear driveshaft angles are steep enough that the CV joints will fail. It is not a question of if, but when. You might get 10-12k miles out of the rear driveshaft or 1k miles out of it, but it will fail at 4" on a 2 door.

It is just plain physics.

Then, when you replace the rear driveshaft with an aftermarket one, you will need rear upper control arms to adjust your rear pinion angle.

When you adjust your rear control arms for the correct pinion angle, your the angle will be steep enough that your rear passenger side spring will have clearance problems with the frame side trackbar bracket and/or the trackbar due to bowing springs. This can be fixed with lower perch wedges and spring retainers, and/or rear lower perch relocation with JKS brackets or cutting and welding.

Also at 4", you will lose wheelbase without rear lower adjustable control arms. Your axle will look funny because it will be located at the front edge of your rear fender well without longer rear lower control arms.

Unless you are going to run 37s or 40s, a 4" lift is unnecessary--especially on a 2 door.

Hopefully you bought the 4" that comes with all 8 control arms. That reduces the amount of missing parts you will need to supplement the kit over time.
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