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Discussion Starter #1
I have the spec sheets on the stock Rubi Unlimited. Does anyone know what part of the Jeep the clearance is measured at?

i.e....frame to ground, bottom of bumper to ground, etc..trying to determine how much lift I actually gained from stock Rubi.:confused:
 

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Discussion Starter #3
I believe ground clearance is measured at the lowest point under the vehicle, which would be the bottom of the differential.
Then I have a second question: If a coil spring lift is installed doesn't that just raise the frame? The axle, I believe, can only be lifted with bigger diameter tires. So how does one measure to determine how much actual lift they got with just the spring lift?
 

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Pick a point on the bottom of the frame near the wheels and measure to the ground. After installing a lift, measure from those same points to determine the amount of lift you actually got. You could also measure from the rockers.

You're right, more ground clearance is gained only with larger tires. And a suspension lift will create the room for those larger tires. The larger the tire size, the more lift you'll need. A 3" lift, for example, is plenty for a 35" tire.
 

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I used three reference points at each corner:
Ground to center of bolt on link of suspension;
ground to frame
ground through center of wheel to bottom of fender flare(just for visual, as they can be moved either way by hand). With my 4" spring lift, I gained 4" in front, 3 1/2" in rear, and leveled it out evenly(had a front rake & slight slant on drivers side when stock). It will go back to having a slight front rake when I put the new bumper & winch on it.
 

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Discussion Starter #6
Pick a point on the bottom of the frame near the wheels and measure to the ground. After installing a lift, measure from those same points to determine the amount of lift you actually got. You could also measure from the rockers.

You're right, more ground clearance is gained only with larger tires. And a suspension lift will create the room for those larger tires. The larger the tire size, the more lift you'll need. A 3" lift, for example, is plenty for a 35" tire.
I used three reference points at each corner:
Ground to center of bolt on link of suspension;
ground to frame
ground through center of wheel to bottom of fender flare(just for visual, as they can be moved either way by hand). With my 4" spring lift, I gained 4" in front, 3 1/2" in rear, and leveled it out evenly(had a front rake & slight slant on drivers side when stock). It will go back to having a slight front rake when I put the new bumper & winch on it.
Thanks guys,my problem is i never took a measurement of the stock Rubi. Do you guys know any of the original measurements?
 

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To measure how much lift you have, measure from a fixed point on the vehicle to the center of a wheel, before and after. Otherwise the additional height gained by larger tires will be included. Of course if you want to know the overall gain (lift + tire) then measure to the ground, but it makes comparative measurements difficult as tire sizes vary so much.
 

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Good point PhilD. That being said, for reference on a stock 4dr Rubicon w/MudTA's at stock psi:
12 7/8t" in front (ground to lower suspension arm bolt on frame)
13 1/8" in rear (ground to lower suspension arm bolt on frame)

After 4" suspension lift:
17" in front (same as above measuring point)
17" in rear
 

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i never took a measurement of the stock Rubi

:shaking:
Thanks guys,my problem is i never took a measurement of the stock Rubi. Do you guys know any of the original measurements?
I'm guilty of this also, so I went to the dealer and measured several "Stock" jeeps. No two came out with the same measurements!
 

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Discussion Starter #11
:shaking:

I'm guilty of this also, so I went to the dealer and measured several "Stock" jeeps. No two came out with the same measurements!
Ya, I believe that is because the springs rate for any given Jeep is based on the option packages it has, i.e. various weights = various spring rate=various heights
 
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