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Old 05-30-2014, 07:03 AM   #31
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Quote:
Originally Posted by danrb View Post
The arms are set by RK specs and verified by a 4x4 shop. Perches sound like a good option, but I don't see anyplace that RK sells them. It don't look right. The wedge they use doesn't seem to be a good solution. You're changing the angle of the spring to prevent bowing, but your only changing the angle on one side of the spring, so bowing makes since. I think RK should dump the wedge and go with a proper correction.
I think they might now ?

Like said... Wedges work but only for minor bow RK "specs" or anybody's specs should only be used as a baseline. 4x4 shops don't always know all this. How is your pinion angle in relation to the DS angle ? Take a pic if you can.

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Old 05-30-2014, 07:15 PM   #32
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RK 1.5 X-Factor Pics, corrected

RK 1.5 X-Factor. Sorry, pic yesterday was not a completed lift pic.
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Old 06-01-2014, 05:37 PM   #33
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Quote:
Originally Posted by kjeeper10 View Post
I think they may now ?

Like I said... Wedges work but only for minor bow
RK "specs" or anybody's specs should only be used as a baseline. 4x4 shops don't always know all this. How is your pinion angle in relation to the DS angle ?
Take a pic if you can.
Front yoke 7 degrees
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This should be ok?
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Old 06-01-2014, 07:47 PM   #34
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Is that at the TC?

Front should be around 2-3* at the pinion.

Rear .. Not sure what stock is. People shoot for a 2* difference with a aftermarket DS. (DS lower then yoke)
With the stock shaft .. 3-4 below is ok.
W/ the rear you don't have caster to fight with. It's whatever works for your application.
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Old 06-02-2014, 07:56 PM   #35
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Danrb

That looks extremely excessive. Can you post up a picture of your lower pinion angle? It could be just the picture angle, but that does not look right. We expect some bowing, but....

Also, the rear lower coil winding should end towards the rear of the vehicle. From the looks of it we are guessing your pinion is over rotated.

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Old 06-03-2014, 06:56 AM   #36
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Originally Posted by Rock Krawler Sus. View Post
Danrb

That looks extremely excessive. Can you post up a picture of your lower pinion angle? It could be just the picture angle, but that does not look right. We expect some bowing, but....

Also, the rear lower coil winding should end towards the rear of the vehicle. From the looks of it we are guessing your pinion is over rotated.

RK
I'll post a picture if you want. Above I posted all the angles. Front 7 degrees, drive shaft 10 degrees and rear is 7.5 degrees. That sounds pretty good from what I read. Also, I'll try rotating the springs. I can see from other pics they are off.
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Old 06-03-2014, 08:50 AM   #37
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I personally don't see any point changing one reputable 1.5 lift for another reputable 1.5 lift. Your travel is limited by shock absorbers in the first place. I have same TF lift as you do, but added 1" TF suspension spacers in the rear for better stance. Otherwise my 2dr looked a little like a cobra ready to attack, with front a little higher, which I didn't like.

Then I added longer shocks, brake lines. Note if your front shocks are too long driveshaft will rub exhaust. You can measure all this by disconnecting shocks and lifting then wehicle, observing what happens with brake lines, drive shafts, stabilization bars etc...
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Old 06-03-2014, 09:05 AM   #38
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I'll post a picture if you want. Above I posted all the angles. Front 7 degrees, drive shaft 10 degrees and rear is 7.5 degrees. That sounds pretty good from what I read. Also, I'll try rotating the springs. I can see from other pics they are off.
That's not what we were asking. Take a pic of the rear DS to pinion relation. I'm assuming the 7* is at the transfer case ? There's no way the front pinion is at 7*, caster would be in the negatives. the jeep would handle like ass, Measure off either of the two front circles on each side of your front diff. These are perpendicular to the pinion flange. Will give you a pretty good estimate. From that # will give caster.

Example
2* = 4* caster
3* = 3* caster
0* = 6* caster

I don't know what rear pinion is stock. I'll see if I can go grab a quick measurement. If the rear pinion is level or greater then the driveshaft, add the fact the axle is moved back 1", the coils will bow. Other interference issues as well.

Good luck
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Old 06-03-2014, 05:09 PM   #39
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Quote:
Originally Posted by kjeeper10 View Post
That's not what we were asking. Take a pic of the rear DS to pinion relation. I'm assuming the 7* is at the transfer case ? There's no way the front pinion is at 7*, caster would be in the negatives. the jeep would handle like ass, Measure off either of the two front circles on each side of your front diff. These are perpendicular to the pinion flange. Will give you a pretty good estimate. From that # will give caster.

Example
2* = 4* caster
3* = 3* caster
0* = 6* caster

I don't know what rear pinion is stock. I'll see if I can go grab a quick measurement. If the rear pinion is level or greater then the driveshaft, add the fact the axle is moved back 1", the coils will bow. Other interference issues as well.

Good luck
Ok found about 10 different ways to describe pinion. Angle of driveshaft to ground is 98.5 degrees. Angle of differential to ground (measured on diff big circle) is 97.5 That gives me 1 degree of down pinion angle, right? I believe that, because the two are lined up pretty close.

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Old 06-03-2014, 05:18 PM   #40
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That does look pretty good. You could bring it down a bit to take out some of the bow. Try -2 or -3. Or leave it and reset perches.

Wow last 2 pics popped up. Man .. those coils are angled in not really bowed.
Are the arms 1" over stock ?
Either suck them in or you need to relocate the perches,
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Old 06-03-2014, 06:36 PM   #41
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Originally Posted by kjeeper10 View Post
That does look pretty good. You could bring it down a bit to take out some of the bow. Try -2 or -3. Or leave it and reset perches.

Wow last 2 pics popped up. Man .. those coils are angled in not really bowed.
Are the arms 1" over stock ?
Either suck them in or you need to relocate the perches,
Ya RK pushes the axle back an inch. I remeasured the lower arms, they are spot on the RK suggested lengths. I'll try rotating the springs and see if that helps. If not I'll need to go with a perch as you suggest.

RK what's your read on things?
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Old 06-03-2014, 07:01 PM   #42
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Ya RK pushes the axle back an inch. I remeasured the lower arms, they are spot on the RK suggested lengths. I'll try rotating the springs and see if that helps. If not I'll need to go with a perch as you suggest. RK what's your read on things?
How did you measure the arms .. On the jeep?
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Old 06-03-2014, 07:31 PM   #43
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How did you measure the arms .. On the jeep?
From center of bolt to center. Lowers are easy. Uppers I'd have to pull off to get a measure.
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Old 06-03-2014, 08:01 PM   #44
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That doesn't work on the jeep trust me. I tried and just recently proved it out with somebody else. Actually 2 others via PM.
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Old 06-05-2014, 01:54 AM   #45
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Will a 2.5" coil lift from RK cause the drive shaft to be out of alignment?
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Old 06-05-2014, 08:11 AM   #46
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That doesn't work on the jeep trust me. I tried and just recently proved it out with somebody else. Actually 2 others via PM.
Think I figured it out. Didn't notice the coil bowing until after adding a rear bumper/tire carrier. Total weight added ~300 lbs. This dropped the height approximately 1.5 inches. Control arms being a fixed length means the axle would have to be pushed back with the drop. Looking at it I'm guessing the axle is two inches back from stock position. The 5 top coils are fully compressed. Giving them a vertical orientation. About the remaining 2/3 of the spring is curved for the two inches back to the axle.
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Old 06-05-2014, 08:44 AM   #47
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Think I figured it out. Didn't notice the coil bowing until after adding a rear bumper/tire carrier. Total weight added ~300 lbs. This dropped the height approximately 1.5 inches. Control arms being a fixed length means the axle would have to be pushed back with the drop. Looking at it I'm guessing the axle is two inches back from stock position. The 5 top coils are fully compressed. Giving them a vertical orientation. About the remaining 2/3 of the spring is curved for the two inches back to the axle.
Not with RK coils. They handle weight great.
The top winds are supposed to be compressed.
Fixed length?

Let me see if I can get RK back.
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Old 06-05-2014, 08:46 AM   #48
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Will a 2.5" coil lift from RK cause the drive shaft to be out of alignment?
Not out of alignment. Caster correction which does affect front pinion/DS angle. On a 2 door (3.5) the rear shaft angle is pretty steep.
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Old 06-05-2014, 08:58 AM   #49
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Not with RK coils. They handle weight great. The top winds are supposed to be compressed. Fixed length? Let me see if I can get RK back.
Yes the arms are adjustable. What I was trying to say is they don't automatically adjust for the drop. So the body dropping will push the axle back. Since the length is fixed. I'll do some measurements tonight, including jacking up the body to pre bumper height and seeing what the springs then look like.
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Old 06-05-2014, 09:10 AM   #50
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I sent a message to RK for ya too
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Old 06-05-2014, 10:14 AM   #51
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Originally Posted by kjeeper10 View Post

Not out of alignment. Caster correction which does affect front pinion/DS angle. On a 2 door (3.5) the rear shaft angle is pretty steep.
I have a 4dr and only plan on using the 2.5 springs with shock extenders.
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Old 06-05-2014, 10:44 AM   #52
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Ok found about 10 different ways to describe pinion. Angle of driveshaft to ground is 98.5 degrees. Angle of differential to ground (measured on diff big circle) is 97.5 That gives me 1 degree of down pinion angle, right? I believe that, because the two are lined up pretty close.

Attachment 1168530
Just from looking at your pinion angle you could go ahead and roll it down a few degrees. Moving the pinion down will help the coil bow. We would be interested to see what the measurements of your arms are. As Kjeeper10 mentioned before the measurements we give are only starting point and every vehicle will sit a little different so some fine tuning of the arm lengths can be needed. At ride height where is your axle located in the rear wheel well? Maybe you could get us a picture of that, so we can see if you would want to shorten the arms up a little to pull the axle forward some.

RK
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Old 06-05-2014, 12:43 PM   #53
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I have a 4dr and only plan on using the 2.5 springs with shock extenders.
Check out the 1.5 coils too. About 2" on a 4 door. 1.5 leaded up.
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Old 06-05-2014, 05:34 PM   #54
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Originally Posted by Rock Krawler Sus. View Post
Just from looking at your pinion angle you could go ahead and roll it down a few degrees. Moving the pinion down will help the coil bow. We would be interested to see what the measurements of your arms are. As Kjeeper10 mentioned before the measurements we give are only starting point and every vehicle will sit a little different so some fine tuning of the arm lengths can be needed. At ride height where is your axle located in the rear wheel well? Maybe you could get us a picture of that, so we can see if you would want to shorten the arms up a little to pull the axle forward some.

RK
Jacked the body up 1.5 inches and things look much better. Will take the arms off this weekend.

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Old 06-05-2014, 06:32 PM   #55
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Sounds good Dan. Thanks RK for helping.

Dan .. Do you have a pic from the side showing the tire in the well?
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Old 06-05-2014, 07:08 PM   #56
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Sounds good Dan. Thanks RK for helping. Dan .. Do you have a pic from the side showing the tire in the well?
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Thanks

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