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Old 07-09-2019, 10:34 AM
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Changing lift hight...

First off, thanks @kjeeper10 for the "Beginner's Guide to Lifting Your JK".


Here's my current status: We have a 2008 JK with what was reported to be 3" of lift on 35" BFG. I'm not entirely sure of the coil lift actual height, but can see that the body is sitting on 1" spacers, so I'm assuming the coils are a 2" lift. This is my daily driver, but love taking it out in the woods on the weekends (and yes, I do have a "Remember stupid, you have to drive this home" sticker inside.. hahaha).


I have already put in a Currie HD tie rod & drag link, and have just been given a set of Rubicon Express 4" coils. I believe the existing control arms are stock, and understand from others that pulling the (what I think are) 2" coil springs and replacing them with 4" coils should require, at least, new front lower adjustable control arms. Assuming this is correct, what about the rear control arms? Yes, I'm sure replacing all 8 CA would be the best option; I'm looking for solid, real-world opinions on if just doing the front lower CA would be sufficient.



I've already went through new wheel bearings and upper & lower ball joints, so just trying to figure out what will be needed before I swap out the coils.


Thanks all!

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Old 07-09-2019, 11:02 AM   #2
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I would start by measuring to see where you are at for a starting point vs assuming. Don't assume. Measure.
There are diagrams on this board on how to measure to see how much lift you have.
Here are two versions of how to measure lift height. The first is for the rear, the second is for the front.
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Old 07-09-2019, 11:22 AM
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@GuzziMoto I guess I shouldn't have used the word "assume"; I was told by the previous owner it was a 3" total lift and I can see the 1" spacers. He treated her as a pavement queen, and I know he didn't do the lift himself, so that means the original owner did the lift.
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Old 07-09-2019, 11:24 AM   #4
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If you're wanting to go 4 inches then you'll at least want to get a double cardan front driveshaft, front lower control arms, rear upper control arms, draglink flip kit, front and rear trackbar relocation brackets and bumpstops. You'll want to make you have extended brake lines or extension brackets.

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Old 07-09-2019, 11:29 AM   #5
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Unless you know what you are doing I would not do a four inch lift by replacing individual parts. I would get a 4" lift kit of a quality brand that includes the required parts. Also, I would look at a 3.5" lift over a 4" lift as that is a more common size rating. Additionally, a typical 3.5" lift will actually lift most Jeeps 4" or more.
But a 3.5" or 4" lift is dramatically more expensive to do right vs a 2.5" lift (which tends to lift 3" or more). And unless you are going bigger than 35" tires, or need extra clearance for hard core off road adventures, a 2.5" lift is typically enough lift for most.
But that is up to you. Too much lift on smaller tires tends to look funny to most, but to each their own.
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Old 07-09-2019, 11:31 AM   #6
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Quote:
Originally Posted by Lockdown View Post
@GuzziMoto I guess I shouldn't have used the word "assume"; I was told by the previous owner it was a 3" total lift and I can see the 1" spacers. He treated her as a pavement queen, and I know he didn't do the lift himself, so that means the original owner did the lift.
Right, but none of that changes the fact that if you want to know where you are now, how much lift your suspension has, you need to measure. Even if you had done the lift yourself, you would still want to measure to know where you are at. If you don't know where you started it is harder to be sure you will end up where you want.
By the way, the 4" coils you have aren't worth very much, and new coils that are what you want exactly would only cost you about $400. It would be a shame to build a lift around a free set of cheap coil springs.
If you add some pictures of your current lift the guys around here may be able to help you, but measuring is easy and will tell you how much height you have in your suspension.
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Old 07-09-2019, 02:51 PM
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So I was told they were 2" coils, the measuring tape says 13" total coil under pressure, guess it's giving me 1" of coil + 1" of spacer total.
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Old 07-09-2019, 04:48 PM   #8
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Quote:
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So I was told they were 2" coils, the measuring tape says 13" total coil under pressure, guess it's giving me 1" of coil + 1" of spacer total.
Stock height of a coil is 9 3/8 from top to bottom. If you measure the shock on a flat surface from eye to eye it's 18 1/2.

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Old 07-10-2019, 06:34 AM   #9
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Then in the rear, measure from the flat bump stop perch on the rear axle (not from any additional bump stop there but from the base perch welded to the axle) to the lip of the cup that holds the bump stop cushion above it on the frame. Don't include the cushion (Jounce), just from the metal perch on the axle to the cup that holds the cushion above it. Stock height is around 5". Any additional distance there beyond 5" is lift height.
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Old 07-10-2019, 06:38 AM   #10
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So I was told they were 2" coils, the measuring tape says 13" total coil under pressure, guess it's giving me 1" of coil + 1" of spacer total.
If you are measuring the front springs, from the base of the spring on the axle to the high point of the cup that holds the top of the spring, and you are getting 13" you have more than 2" of spring lift. As mentioned, that is around 9 3/8" stock height.
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Old 07-10-2019, 11:13 AM
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Ok, so apparently I watched the wrong YouTube videos on how to measure. @GuzziMoto, I didn't see your images yesterday morning, glad I can now as they clear up quite a bit of misinformation I came across from other sources.



So, for the front, I measure 11.25" from the two points indicated on the graphic. From the rear, I measure 6.5" from the two points indicated on the graphic. If I'm understanding this correctly, that's putting me at around 1.3 to 1.5" of actual lift under regular weight (EAG bumper w/winch, spare tire on rear gate)...



Therefore, my guess is the brake lines, etc., are still stock lengths, and will have to be replaced if I'm putting those gift springs in... some research says they are supposed to give a JK 5.5" of lift; I'd guess I'd probably be around 4.5" actual lift with weight.
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Old 07-10-2019, 12:11 PM   #12
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Ok, so apparently I watched the wrong YouTube videos on how to measure. @GuzziMoto, I didn't see your images yesterday morning, glad I can now as they clear up quite a bit of misinformation I came across from other sources.



So, for the front, I measure 11.25" from the two points indicated on the graphic. From the rear, I measure 6.5" from the two points indicated on the graphic. If I'm understanding this correctly, that's putting me at around 1.3 to 1.5" of actual lift under regular weight (EAG bumper w/winch, spare tire on rear gate)...



Therefore, my guess is the brake lines, etc., are still stock lengths, and will have to be replaced if I'm putting those gift springs in... some research says they are supposed to give a JK 5.5" of lift; I'd guess I'd probably be around 4.5" actual lift with weight.
If that is where you are at currently on lift, you would have to do a lot to get those "free" springs to work right. You would need new, longer shocks and matching bump stop extensions. You would need something to adjust castor. You would need to do something about drive shaft to exhaust crossover clearance. You would want to do something about your track bars front and rear (otherwise your axles will be off center), and you would want to run a rear track bar bracket appropriate for the amount of lift. You might need to do something about steering, like a drag link flip / high steer kit.
There is a reason why a 4" lift is expensive to do right. Just swapping springs is probably not going to work out very well.
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Old 07-10-2019, 01:17 PM   #13
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As hard as it may be, I would ditch those springs and research ALOT about what you are wanting to do with your jeep. Enjoy it and actually take it offroad and then see what you may want. I made a lot of bad decisions my first go around because I was on a budget. Save your money and buy quality parts the first time and do it right.

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Old 07-10-2019, 01:22 PM   #14
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If that is where you are at currently on lift, you would have to do a lot to get those "free" springs to work right. You would need new, longer shocks and matching bump stop extensions. You would need something to adjust castor. You would need to do something about drive shaft to exhaust crossover clearance. You would want to do something about your track bars front and rear (otherwise your axles will be off center), and you would want to run a rear track bar bracket appropriate for the amount of lift. You might need to do something about steering, like a drag link flip / high steer kit.
There is a reason why a 4" lift is expensive to do right. Just swapping springs is probably not going to work out very well.
Listen to the man ^^^^^..... i am on 3.5" (sitting at 4")and I bought the Mopar kit and still had to add a ton of stuff to actually make it work ...

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Old 07-10-2019, 01:40 PM   #15
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Originally Posted by GuzziMoto View Post
If that is where you are at currently on lift, you would have to do a lot to get those "free" springs to work right. You would need new, longer shocks and matching bump stop extensions. You would need something to adjust castor. You would need to do something about drive shaft to exhaust crossover clearance. You would want to do something about your track bars front and rear (otherwise your axles will be off center), and you would want to run a rear track bar bracket appropriate for the amount of lift. You might need to do something about steering, like a drag link flip / high steer kit.
There is a reason why a 4" lift is expensive to do right. Just swapping springs is probably not going to work out very well.
Listen to the man ^^^^^..... i am on 3.5" (sitting at 4")and I bought the Mopar kit and still had to add a ton of stuff to actually make it work ...

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Old 07-11-2019, 12:52 PM
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Thanks all. I'm thinking the existing springs I have are probably Rubicon Express 2" springs; I'm thinking they have had their better days, and don't like the extra weight of my EAG bumper & RR winch... toying with the idea of not using the free 4.5/5.5 coils, and instead getting dual rate 3.5 coils, thinking they may settle down to about 3" of lift when all done. This way I'm hoping to get the height of the original intended lift, without having to replace much. The RE shocks on there now are good for up to a 3.5" lift, and I'm thinking the brake lines, track bars and control arms I already have would probably be ok this way...
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Old 07-11-2019, 01:49 PM   #17
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Thanks all. I'm thinking the existing springs I have are probably Rubicon Express 2" springs; I'm thinking they have had their better days, and don't like the extra weight of my EAG bumper & RR winch... toying with the idea of not using the free 4.5/5.5 coils, and instead getting dual rate 3.5 coils, thinking they may settle down to about 3" of lift when all done. This way I'm hoping to get the height of the original intended lift, without having to replace much. The RE shocks on there now are good for up to a 3.5" lift, and I'm thinking the brake lines, track bars and control arms I already have would probably be ok this way...
If you are going up to 3 inches you'll still need more than just springs. Check to see if they installed brake line extension brackets or front and rear trackbar relocation brackets. You'll still want something to correct your caster in the front via control arms or geo brackets. There's probably a thread somewhere that talks about different lift sizes and what you'll need. Research before you pull the trigger

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Old 07-12-2019, 07:58 AM   #18
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Since it hasn't been asked......why do you want so much lift? Are you finding that you're about to rip off a fender when the sway is disconnected while wheeling? Or is there some other reason.

Resulting lift is very vehicle dependent. On my JKU sport, I have 2.5" of front spring lift and 1" of rear spring lift. With only a steel front bumper and the spare relocated inside the cargo area, this results in a flat (no Jeep rake) stance measured to about 1.5" of actual lift. I'm running 295 tires to raise things a bit as well. To help with things, I've removed the brake line brackets under the shocks and zip tied them up the body of the shock (very common) really more "just in case" than anything else.

When researching lifts, look to see if the "resulting lift" is given, assuming a setup that matches yours. Common add ons of front bumper with winch and rear bumper with tire rack will matter.
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Old 07-12-2019, 08:30 AM   #19
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Along those lines, what size tires are you running or plan to run. What do you use the Jeep for (i.e., what sort of off roading do you do?)?
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Old 07-12-2019, 09:11 AM
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@Jlorenz1980, @Jack FFR1846 (BTW, I was a D/S in Plymouth) & @GuzziMoto


My 08 JK already has 35" BFG tires (which I know are not 35" diameter any longer, if ever, but planning on staying with 35s) and 3" of lift, but the old 2" coils have sagged significantly; this is reason for my original inquiry. It is my daily driver, but I do take it in the woods almost weekly. The trails around here other times of the year are dry to muddy (maybe up to 12-18" of mud); currently they are under significant water. A few weeks ago I was going through 3' of water out there.

As she already had 3" of lift, I'm thinking that going with Metal Cloak dual rate 3.5 coils for my 2 door should settle slightly, resulting in the original lift height of 3", meaning I shouldn't have to change out much, if anything. At least that's my current thought process.
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Old 07-12-2019, 09:25 AM   #21
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@Jlorenz1980, @Jack FFR1846 (BTW, I was a D/S in Plymouth) & @GuzziMoto


My 08 JK already has 35" BFG tires (which I know are not 35" diameter any longer, if ever, but planning on staying with 35s) and 3" of lift, but the old 2" coils have sagged significantly; this is reason for my original inquiry. It is my daily driver, but I do take it in the woods almost weekly. The trails around here other times of the year are dry to muddy (maybe up to 12-18" of mud); currently they are under significant water. A few weeks ago I was going through 3' of water out there.

As she already had 3" of lift, I'm thinking that going with Metal Cloak dual rate 3.5 coils for my 2 door should settle slightly, resulting in the original lift height of 3", meaning I shouldn't have to change out much, if anything. At least that's my current thought process.
It sounds like you should be looking at 2.5" coils, which will typically give you an actual lift of 3" to 3.5". A set of 3.5" Metal Cloak coils would likely give you 4" or more of lift and / or mess up the way your Jeep drives without additional adjustments.
I would look at 2.5" coils. If you are heavy, the Metal Cloak coils are a good choice as they are made for heavy Jeeps. If you are not heavy they may give you more lift than you wanted and they may ride a bit rough.
Other options would be AEV 2.5" coils (also good for heavy Jeeps), TF 2.5" coils, OME 2" coils, and the Mopar 2" coils (which, despite the name, are 2.5" coils and average around 3" of lift).
Also, for your stated usage I can't see any reason why you would need more than a 2.5" coil.
But that is up to you. I will say that if you want a 3.5" lift I would get the whole lift and not just the coils. Unless you are not at all picky about how your Jeep drives I can't imagine being happy with a 2" lift running 3.5" - 4" coils. There is a reason why 3.5" and higher lifts come with so many extra parts (and cost so much as a result).
A cheaper option to recover some height would be to install a set of 1" spacers (or whatever size spacer you need to get the lost height back).
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Old 07-15-2019, 02:12 PM   #22
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A cheaper option to recover some height would be to install a set of 1" spacers (or whatever size spacer you need to get the lost height back).
This is what I would recommend. Weight matters a ton on a Jeep. The reason there are all these ways to measure lift is because adding a front steel bumper, then some skids, then a winch, then a tire bracket all add up. I have 2.5" of front spring spacer on mine and I believe I have between 1" and 1.5" front lift. My rear has a 1" spacer and my rock rails (frame mounted) are nearly level. There is "Jeep Rake" that probably figure in there too. Oh, and I screw things up with only a front steel bumper and no spare on the back...it's inside.
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Old 07-17-2019, 10:49 AM
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Thanks all. For now, I've added 1.75" spacers on the front, and have .75" spacers going on the rear. I'll install the new springs after the Jeep is out of warranty.

The simple addition of the spacers did indeed recover the lost height.
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