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Unread 05-28-2013, 07:41 PM   #1
BionicOnion
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lift height estimate?

my yj has tires that are measuring a true 32inches tall. from the top of the tire i have approx 11.5 inches to the fender. im looking for some input as to my lift height. this is on the rear by the way. measurements were taken at the top of the tire to straight above that point in the middle

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Unread 05-28-2013, 08:01 PM   #2
roadyrob
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stock height to the rocker panel is 18" you should be able to figure your height from that. or post some pics.
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Unread 05-29-2013, 06:59 AM   #3
Rproject
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32's + 11.5" sounds like quite a lot of space. Can you post a pic? That would help dramatically. The easiest way is to upload a pic to Photobucket and link to it.
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Unread 05-29-2013, 12:42 PM   #4
imstillatwork
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Lift high increase over stock is determined by:

RH = Actual Rocker Height
TH = Actual Tire Height
BL = Body Lift
SH = Shackle Length

(RH - 18) - (((TH - 28) / 2) - (BL))

If RH = 26" and TH = 33" with no body lift we get

(26 -18) - (((33 - 28) / 2) - (0)) = Total Lift of 5.5" lift over stock.

We can further determine the spring lift as

Total Lift - ((SH - 4) / 2)

If shackle length bolt to bolt is 6" than Spring Lift is 5.5 - ((6 - 4) / 2) = 4.5" Springs.

Make sure to measure on level smooth ground just to the bottom of the rocker panel under the doors.
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Unread 05-29-2013, 02:57 PM   #5
XJ93
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Would also be helpful to know if it is sua or soa.
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Unread 05-29-2013, 03:24 PM   #6
Anticanman
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Quote:
Originally Posted by imstillatwork View Post
Lift high increase over stock is determined by:

RH = Actual Rocker Height
TH = Actual Tire Height
BL = Body Lift
SH = Shackle Length

(RH - 18) - (((TH - 28) / 2) - (BL))

If RH = 26" and TH = 33" with no body lift we get

(26 -18) - (((33 - 28) / 2) - (0)) = Total Lift of 5.5" lift over stock.

We can further determine the spring lift as

Total Lift - ((SH - 4) / 2)

If shackle length bolt to bolt is 6" than Spring Lift is 5.5 - ((6 - 4) / 2) = 4.5" Springs.

Make sure to measure on level smooth ground just to the bottom of the rocker panel under the doors.
Well done!!
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Unread 05-29-2013, 07:51 PM   #7
BionicOnion
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excellent responses considering i didn't give much info at all. it's a custom built spring set that is SUA. I realize that it seems like a lot of room as this was built with room for 46 inch tires with it SOA. I couldn't keep it legal for the street so i went SUA on the same springs and was shooting for 37-40 tire when done. I dont have the front axle bolted back in as it's a 78 k20 8 lug match for my 14 bolt and once i get the welding done and it rolled back under it's a custom SUA chevy 10 bolt i know i hear it's junk but hey it's what i got till i can afford a 60. Ill try to get some pics of where it sits for now. by the way ill get a rough guess based on your formula when i get my pics in a few minutes...check back tonight
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Unread 05-29-2013, 08:34 PM   #8
BionicOnion
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ok as promised here's a few pictures. forgive me for some of the work being imcomplete..it is an ongoing project *read 4 years now*

first few pics are of the back as requested.




i didn't get a picture of the rocker below the door as it would be around 1/2 inch off due to front not being on tires yet. but if memory serves me right it was right around 28 inches.

heres what's going on with the front axle first a stock pic
so yeah...if you google a chevy 10 bolt front axle you'll understand that it was never meant to be SUA. we flipped it upside down and went to town on the pumpkin side. clearancing the webbing and working a bit on the perch. we arrived at this after grinding

and the test fit of the modified perch


and a quick pic of the engine bay still in progress but close to done.

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Unread 05-29-2013, 08:43 PM   #9
95YamJam
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Lift height would have to be measured at the rocker with the comp cut there it's hard to tell.

I have 9" from the top of my 36" tire to my comp cut fender. I have a 2.5" sua suspension lift, 1" BL, and 1" shackle lift.

So my guess would be you have about 3-5" of total lift? My comp cut looks higher than yours though. I have about 3/8 of an inch of lip on mine at the edge.

Looks great!
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Unread 05-29-2013, 09:55 PM   #10
BionicOnion
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thanks 95. i didn't actually cut UP on that line. i removed the rear fender flare and cut level with the top backwards to the seam. now i gotta weld some back in i think im going to roll up a set of 7inch rugged ridge flares as they should cover all but 1/2 inch of my tread of full widths.
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Unread 05-29-2013, 10:46 PM   #11
95YamJam
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Thats cool! I don't run flares at all. Don't have to here. It throws mud every where but i don't care.
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Unread 03-13-2014, 01:10 AM   #12
zippoguy
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Hi all, I am trying to order new shocks for my YJ, but I have to order them based on my lift. I have 25.5" to the bottom of my rocker and although my tires are kuhmo 32" tires (will be changing them soon), they measure only 30.5", don't know if they don't have enough air in them or what not, but both front and rear measure to that.

So based on the formula, I have a 6" lift, possibly, but it really doesn't feel or seem like it. Please help.

I attached a couple of pictures, sorry they might not be the right ones, but they are the only ones I got on this device right now.

Thanks in advance.
image.jpg

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Unread 03-13-2014, 01:11 AM   #13
zippoguy
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.
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Unread 03-13-2014, 01:12 AM   #14
zippoguy
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image.jpg

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Unread 03-13-2014, 01:32 AM   #15
baritone_mike
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If you want to do it right don't order shocks off of lift, actually measure what size shocks you need.

If you can remove all 4 shocks and flex the Jeep until you lift a tire. Grab a tape measure and measure the distance between the two shock mounting locations (frame and axle) at each corner of the Jeep. That is the shock size you need. The front shocks will need to go from the longest to the shortest measurement on the two front corners and the rear shocks will have to go from the longest to the shortest measurement on the rear corners. Add a little length to the long measurement and subtract a little length from the short measurement so you are not bottoming out or over extending your new shocks and that is the Eye to Eye working limits of the shocks you need.


If you can't flex the Jeep out and measure with no shocks, the next best thing to do is with the Jeep on flat ground measure the distance between the two shock mounting locations (frame and axle) on both axles, this is your static length. Then measure the distance between the bump stops and axle and subtract that from your static length (you will have to do some trigonometry on the rear) and this is your compressed length. Just order shocks that have a body length about a half inch shorter than your compressed length and if need be run limiting straps to prevent over extending a shock.

Obviously the first method is the better way to do it.
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