Stock yj heigth??
Have a 1991 yj with a lift and don't know how many inches the lift is any one know what the stock height is?

What tires are on it?

31s

Could just have 1" shackles, you can really only fit 30's under the stock suspension, unless you change flares.

I know it's taller than that though because 33s could fit easy, do you know what the stock height is so I could just measure and subtract the difference?

no idea, but if you can fit 33's then you have about a 4" lift.

so from what im reading the stock ride height is any where from 69.6 in (hard top) to 72 in (soft top)

Okay thank you for the help

differential
From what I understand, the differential height is 9" and the height to the body under the door is 18". Measure the differential height, compensate for the door height and the rest is lift.

I have a 6in lift with 33s and the body underneath the door is 26 inches and my differentials are 11inches.

that works out
11" at the differential minus the 9" = 2".
2" tire add + 6" lift = 8" 18" + 8" = 26". 33" tires against 29" stock is 4" = 2" higher differential. Love it when a plan comes together. :thumb: 
Mine is a stock 93 with 29" tires and I have 9" to differential and 19" to bottom of body under the door.

Dang!!
And just when I thought the plan had come together....
Mine is a 94 stock, 9" to bottom of front differential and 18" to body. But my springs look very flat and I figured they had settled a little. But the spec's call for 18". Could just be the difference in spring arc. 
Not so fast
Quote:
I would say your calculations are pretty accurate. 
Yj stock height = not enough

You can't go by the math exactly. Over the years the jeep will sag some.

that's what I was checking
It looked like my springs had sagged as there was only about 1.5" between axle and snubbers. But according to the original specs (9"/18") mine was right on. Actually it was 9" to diff and I have 235's on it. But only 1/2" there.

Ok. So mine has 31s. Dont know lift either but 33s look like they will fit
So i just measure from ground to jeep under door stock should be 18 lets.say.mine is 22 Do i subtract for tire what is stock tire 28 inches Need to know about to buy tires 
Sorry. Stock tire is 29 my bad. I ll try to figure it out

Couldnt i just add a inch.to top of tire to.see.if.33s will.work

add or subtract
Measure the height to the bottom of the differential. Say it is 9.75". Then add .75" to 18". The bottom of the door should be 18.75 for standard suspension. If yours is 20.75, then you have a 2" lift.

Curious. What is .75. For

Oh. Ok. For tire size.

Ok. Rear diff is 8.75 inches. And bottom of door is a little bit above 22 1/2 and.have 31 inch tires. So .i guess i.have a 2 1/2 lift. I guess 33s will work

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