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?
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, Method Standard wheels, 35" MTR Kevlars, Englewood driveshafts, Synergy 3" Lift, Rancho 9000XLs, Artec truss, Teraflex C-gussets, Grabars, HotHead Liners, MORE dead pedal, Tuffy underseat box, Uniden 520 XL, 10lb CO2 tank...
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.
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.
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.
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.
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