4" YJ lift= 4" CJ, and questions. - Page 2 - JeepForum.com
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post #16 of 19 Old 05-10-2013, 07:54 PM Thread Starter
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1979 CJ5 
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Humm looks like there might not be any getting away from super long shackles on a YJ conversion. unless I want really arched springs.

EDIT: the springs were equal on your CJ even using the same shackle, so the shackle length of a CJ remains a CJ constant. 1/2" CJ length is still 1/2" and a YJ shackle would be that much longer.

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post #17 of 19 Old 05-10-2013, 09:48 PM
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Originally Posted by skizriz View Post

Exactly. Stock YJ shackles are 1" longer.
Stock cj shackles are 3" eye to eye.

The 3.5" YJ springs would be factored with 4" shackles.
So you would need 5" shackles to reach your 4" of total lift.
You're over-thinking this. The shackle length has nothing to do with how much lift the springs give. Using the 3.5" springs is going to give an additional 3.5" of lift over stock springs regardless of the length of the shackle, as long as the shackle length remains constant.

So 3.5" springs on a CJ will with stock CJ shackles will still give 3.5" lift. Add 1/2" CJ lift shackles to net a total of 4"

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #18 of 19 Old 05-11-2013, 08:38 AM
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It's been 20 years since i did mine but I used a 2.5" YJ spring. i don't remember what brand though.
My CJ has a 1" body lift and a 1" frame lift and it easily clears the 35" Pit Bull Rockers I have now.

85 CJ7, Howell TBI, Twin Stick, 4:10's, 35" Pitbull Rockers, Clifford 6=8, Detroits, Matkins Level II, BDS 4", Summers Brothers. Skynyrd rocks.
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post #19 of 19 Old 05-11-2013, 08:45 AM
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Originally Posted by jp360cj View Post
You're over-thinking this.
Yeah, I tend to do that. I just hate running into surprises at the last moment (although I still usually do. )
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