4" YJ lift= 4" CJ, and questions. - Page 2 - JeepForum.com
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Unread 05-10-2013, 07:54 PM   #16
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1979 CJ5 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 828
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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Unread 05-10-2013, 09:48 PM   #17
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1977 CJ7 
Join Date: Oct 2007
Location: Greenville, North Carolina
Posts: 1,754
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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Unread 05-11-2013, 08:38 AM   #18
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1985 CJ7 
Join Date: Feb 2010
Location: Wisconsin
Posts: 345
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.
06 Rubicon
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Unread 05-11-2013, 08:45 AM   #19
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1978 CJ7 
Join Date: Jun 2011
Location: , Pa
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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. )
78 CJ7 258 TH400/Dana18 SOA/stock YJ springs 35" General Grabbers.
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