Rear upper CA help - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-22-2014, 01:36 PM   #1
Jeeper
 
CSAND74's Avatar
 
Join Date: Jun 2013
Location: Spring Lake, NC
Posts: 62
CSAND74 is on a distinguished road
Rear upper CA help

I'm in the process of installing RK rear uppers, they are recommending 19" center to center measurement for a 2.5" lift. The factory arms are 17 3/8. Has anyone installed these before using 19" as a starting point?
__________________
Have an A1 day!
CSAND74 is offline   Quote
Old 03-22-2014, 02:53 PM   #2
Jeeper
 
Join Date: Oct 2011
Location: Olympia, WA
Posts: 3,887
nwbronco is on a distinguished road
Numbers are general. Disconnect the frame side of both. Get the rear pinion pointed to the transfer case output. I use a floor jack and a 2x4. Get the pinoin where you want it. adjust the arms to fit.

nwbronco is offline   Quote
Old 03-22-2014, 03:01 PM   #3
Jeeper
 
HK_Runner's Avatar
 
Join Date: Apr 2012
Location: Ken Caryl Valley, Colorado
Posts: 2,993
HK_Runner is on a distinguished road
RK (at least the X Factor) also lengthens or recommends lengthening the wheelbase by moving the rear axle an inch rearwards. I think they do that mostly to avoid pinch seam contact. I'd rather cut the pinch seam. nwbronco's recommendation seems to be the right one- go with the pinion angle and see where things fall.
__________________
2014 JKU Rubicon- all white with tan leather

LOD front bumper, AEV rear bumper, TeraFlex tire carrier, Shrockworks sliders, Mopar Big Brake Kit, Method The Standard wheels, 35" MTR Kevlars, Englewood driveshafts, Synergy 3" Lift, Rancho 9000XLs, Artec truss, Teraflex C-gussets, Grabars, HotHead Liners, JW Speakers, MORE dead pedal, Tuffy underseat box, Uniden 520 XL, 10lb CO2 tank...
HK_Runner is offline   Quote
Old 03-22-2014, 03:42 PM   #4
Jeeper
 
CSAND74's Avatar
 
Join Date: Jun 2013
Location: Spring Lake, NC
Posts: 62
CSAND74 is on a distinguished road
That's kinda what I was thinking just needed reassurance. Thanks for the help
__________________
Have an A1 day!
CSAND74 is offline   Quote
Old 03-22-2014, 04:31 PM   #6
Jeeper
 
CSAND74's Avatar
 
Join Date: Jun 2013
Location: Spring Lake, NC
Posts: 62
CSAND74 is on a distinguished road
Just on the front, I got the rear uppers to straiten out the rear ds a little
__________________
Have an A1 day!
CSAND74 is offline   Quote
Old 03-22-2014, 04:39 PM   #7
gsn
Jeeper
 
Join Date: Jul 2012
Posts: 574
gsn is on a distinguished road
But... if you lengthen only the uppers, you will be rotating the axle rearwards. That will give you an epic coil bow, more than what a 2.5 lift by itself will give you. Make sure you get coil wedges. Unless you are planning on cutting and rewelding the perches.
gsn is offline   Quote
Old 03-22-2014, 04:47 PM   #8
WF Moderator

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 51,925
kjeeper10 is on a distinguished road
From the site or after talking to RK and special ordering a shorter set?

There's only one set of uppers. Only to be used with their longer lowers. (2 sets of lowers)

Those will be too long and even at the shortest setting won't be enough to bring the pinion up.
You do want to lengthen uppers for pinion angle but only a small amount.

You need their longer lowers for the 1" stretch or shorten those arms.
If you have a chop saw the threads are deep enough to shorten them or RK will do it for you.

Ask how I know this
kjeeper10 is offline   Quote
Old 03-22-2014, 04:50 PM   #9
WF Moderator

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 51,925
kjeeper10 is on a distinguished road
From the site

NOTES! (Upper rears)
* Recommend having adjustable lower control arms.


NOTES! (Lowers rear)
RK02022 - Rear Lower Control Arms * Requires Adjustable Rear Uppers
RK02064 - Rear Lower Control Arms * For use with Factory Rear Uppers
kjeeper10 is offline   Quote
Old 03-22-2014, 04:55 PM   #10
Jeeper
 
CSAND74's Avatar
 
Join Date: Jun 2013
Location: Spring Lake, NC
Posts: 62
CSAND74 is on a distinguished road
Lol. Well damn, I guess I'll see a bout cutting these down or just order the lowers which I was already considering. After seeing how good the fronts look the stock rears just bother me...OCD kicking in. Plus if and when I go up a little it will be one issue already covered.
__________________
Have an A1 day!
CSAND74 is offline   Quote
Old 03-22-2014, 04:57 PM   #11
Jeeper
 
CSAND74's Avatar
 
Join Date: Jun 2013
Location: Spring Lake, NC
Posts: 62
CSAND74 is on a distinguished road
Quote:
Originally Posted by kjeeper10 View Post
From the site

NOTES! (Upper rears)
* Recommend having adjustable lower control arms.

NOTES! (Lowers rear)
RK02022 - Rear Lower Control Arms * Requires Adjustable Rear Uppers
RK02064 - Rear Lower Control Arms * For use with Factory Rear Uppers
Wish I would have seen that one. Thanks for the help
__________________
Have an A1 day!
CSAND74 is offline   Quote
Old 03-22-2014, 05:01 PM   #12
WF Moderator

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 51,925
kjeeper10 is on a distinguished road
I agree with HK w/ pushing the axle back. You run into coil bowing (even with wedges) track bar issues. Then you need to move the swaybar back which is not a huge problem. This is meant to keep a 37" tire off the seams.
I would shorten them but eventually get the shorter lowers. Just enough adjustability to center the wheel in the well and move the pinion up a little.
kjeeper10 is offline   Quote
Old 03-22-2014, 05:23 PM   #13
Jeeper
 
Join Date: Oct 2011
Location: Olympia, WA
Posts: 3,887
nwbronco is on a distinguished road
I installed Rock Krawler rear uppers RK02028's on my 2 door. I needed to correct the pinion angle. With the stock lower I only needed to spin the joint out a few turns. The pinion now points at the rear output of the transfer case. There is not a lot of bow of the springs.

Which arms did you get?
nwbronco is offline   Quote
Old 03-22-2014, 05:38 PM   #14
WF Moderator

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 51,925
kjeeper10 is on a distinguished road
Quote:
Originally Posted by nwbronco View Post
I installed Rock Krawler rear uppers RK02028's on my 2 door. I needed to correct the pinion angle. With the stock lower I only needed to spin the joint out a few turns. The pinion now points at the rear output of the transfer case. There is not a lot of bow of the springs. Which arms did you get?
There's only 1 part #

Proper angle is a couple degrees lower then the DS with a double carden. W/ The stock shaft, don't think it will matter much.

What is your lift height ?

I had these arm but sold them. Way to long for what I wanted to so. Move the pinion up
kjeeper10 is offline   Quote
Old 03-22-2014, 05:55 PM   #15
Jeeper
 
Join Date: Oct 2011
Location: Olympia, WA
Posts: 3,887
nwbronco is on a distinguished road
Started out as a 3.5" Rubicon Express lift on my '07 4 Door. Moved it to a '14 2 Door and am now at about 5".

Moved the pinion angle. So I guess I should have said rotated.
nwbronco is offline   Quote
Old 03-22-2014, 06:00 PM   #16
WF Moderator

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 51,925
kjeeper10 is on a distinguished road
Quote:
Originally Posted by nwbronco View Post
Started out as a 3.5" Rubicon Express lift on my '07 4 Door. Moved it to a '14 2 Door and am now at about 5". Moved the pinion angle. So I guess I should have said rotated.
Makes sense. You needed quite a bit of arm to rotate the pinion back at the height,
kjeeper10 is offline   Quote
Old 10-14-2015, 09:37 PM   #17
Jeeper
 
wjfawb0's Avatar
 
Join Date: May 2008
Location: Tennersee
Posts: 465
wjfawb0 is on a distinguished road
I'm thinking about a Rock Krawler 2.5" Flex kit and then adding the RK02064 lowers in the rear. At the same time I've considered the Teraflex coil lift with all four of the sport arms, too. The rock krawler stuff seems like a better value, but the teraflex would be an easier install. Any thoughts? At the moment I'm more worried about the bump stops, wedges, brake lines, and fitting in my home and work garages.
wjfawb0 is online now   Quote
Old 10-14-2015, 11:13 PM   #18
Jeeper
 
Greg22585's Avatar
 
Join Date: Aug 2015
Location: Memphis,TN
Posts: 647
Greg22585 is on a distinguished road
I have the RK 3.5 X Factor lift and I just put 37/13.5 Toyo MT's on ab 2 hours ago, inside my residential garage and I backed out with no problem.
Greg22585 is offline   Quote
Old 10-15-2015, 12:51 PM   #19
Jeeper
 
wjfawb0's Avatar
 
Join Date: May 2008
Location: Tennersee
Posts: 465
wjfawb0 is on a distinguished road
When I get home I'm going to measure the clearance to my door when up. As it is now, my 3' firestick mounted on the spare tire carrier pokes up maybe 5" or 6" above my soft top and it scrapes the weather stripping on the door when I drive in and out. My F150 antenna smacks the bottom of the door on any of the openings. The F150 is completely stock.

It may just be my bad luck with the guy who framed the house:


wjfawb0 is online now   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 07:58 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner