cj to yj leaf spring conversion - JeepForum.com

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post #1 of 14 Old 10-28-2011, 11:44 AM Thread Starter
David2012
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cj to yj leaf spring conversion

Im looking to do the cj to yj leaf spring conversion.. does using the rear cj spring plates in the front actually work? are the leafs going to sag faster than my cj springs? the cj springs are superlift and the yj springs are also aftermarket. I have a 1.5inch lift or so and the yj springs are about a 6inch if im not mistaken, am i going to experience a good amount of lift or are the softer yj springs going to be about the same height? im staying sua


Electrical gremlins will be the death of me... 85 cj7
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post #2 of 14 Old 10-28-2011, 12:30 PM
commadore64
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Not sure about using the rear plates on the front... the holes have to be wider and I don't know if there is enough material. Someone else will have to answer that. Just finished my YJ spring conversion... what I did was purchase a set of front YJ plates and had bolts welded on for the shocks. If you want me to, I can post a pic for ya. Let me know.

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post #3 of 14 Old 10-28-2011, 02:41 PM
dan-cj7
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If you have access to a wrecker or an old YJ you can use the front spring plates from them. I have an 84 CJ and I used the front spring plates from a 93 YJ. The only modification I had to do was drill out the holes on the left side hanger to suit the u-bolt for the CJ axle. The hole pattern on the right hand side fit for the bolt that goes over the diff.

The shackle hangers for the front have to be changed to suit the longer YJ spring. I used the hangers from MORE offroad and they fit perfectly. They had a hole that goes over the rivet for the the front crossmember and you can use the original bolt holes so there wasn't a need to remove the rivet like some other systems do. I may not even have to modify the bolt for the bumper. I haven't got that far yet.

BTW I used Old Man Emu springs with a 2.5" lift.

1984 CJ7 - Under construction
4.6L stroker with MPI & AX15 with D300
OME 2.5" YJ springs
http://www.jeepforum.com/forum/f8/dans-downunder-84-cj7-build-1299387/
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post #4 of 14 Old 10-28-2011, 02:53 PM
gcoupe
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any pic of the front hangers on the car?? I am going to do the same conversion on my M38A1...
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post #5 of 14 Old 10-28-2011, 03:06 PM
scso81
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To the guys that have done or are doing a yj to a CJ spring swap, please post some pictures and advise where you got what parts for your conversion.

I am looking to swap in a set of yj rear 4" over stock springs onto my 80 CJ7 front end. Thanks in advance!
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post #6 of 14 Old 10-28-2011, 03:23 PM
Matt1981CJ7
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post #7 of 14 Old 10-28-2011, 03:42 PM Thread Starter
David2012
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Quote:
Originally Posted by commadore64 View Post
Not sure about using the rear plates on the front... the holes have to be wider and I don't know if there is enough material. Someone else will have to answer that. Just finished my YJ spring conversion... what I did was purchase a set of front YJ plates and had bolts welded on for the shocks. If you want me to, I can post a pic for ya. Let me know.

please post pics. My friends yj is toast (hence my signature), frames all bent up and the body is in shambles but everything else is fine. so hes my "doner". So i will have all the yj parts i need so what you are recomending sounds great.

Electrical gremlins will be the death of me... 85 cj7
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post #8 of 14 Old 10-28-2011, 03:44 PM Thread Starter
David2012
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Quote:
Originally Posted by dan-cj7 View Post
If you have access to a wrecker or an old YJ you can use the front spring plates from them. I have an 84 CJ and I used the front spring plates from a 93 YJ. The only modification I had to do was drill out the holes on the left side hanger to suit the u-bolt for the CJ axle. The hole pattern on the right hand side fit for the bolt that goes over the diff.

The shackle hangers for the front have to be changed to suit the longer YJ spring. I used the hangers from MORE offroad and they fit perfectly. They had a hole that goes over the rivet for the the front crossmember and you can use the original bolt holes so there wasn't a need to remove the rivet like some other systems do. I may not even have to modify the bolt for the bumper. I haven't got that far yet.

BTW I used Old Man Emu springs with a 2.5" lift.
could you maybe link me to the shackle hangers you are talking about? and im going to be using fabtech 3.5inch lift and hopefully, if they will work, boomerang shackles.

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post #9 of 14 Old 10-28-2011, 03:50 PM Thread Starter
David2012
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Quote:
Originally Posted by Matt1881CJ7 View Post
This thread should have all the pictures and info you need:

http://www.jeepforum.com/forum/f8/ol...stall-1245523/

Matt
thank you matt. lots of great info and pics

Electrical gremlins will be the death of me... 85 cj7
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post #10 of 14 Old 10-28-2011, 03:52 PM
Matt1981CJ7
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Quote:
Originally Posted by David2012 View Post
thank you matt. lots of great info and pics
You are welcome.

Good luck with your suspension.

Matt
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post #11 of 14 Old 10-28-2011, 07:44 PM
commadore64
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Here is a pic of the YJ spring plates I modified. Purchased 2 grade 8 bolts to use for shock mounts, cut the heads off had them welded to the plates with a bushing stop sleeve and trimmed off the excess threads... I think they came out pretty good. Oh, and as mentioned before, had to elongate two of the holes on the left side plate. As far as spring mounts go... no question... use Crabtree mounts... the last three pics. Can't beat them... and made in the USA!
Attached Thumbnails
IMG-20110924-00068 jf.jpg   Rockingham-20110812-00042 jf.jpg   IMG-20110828-00048 jf.jpg   IMG-20110829-00049 jf.jpg  
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post #12 of 14 Old 10-29-2011, 01:14 AM
dan-cj7
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I'd love to post photos but being a newb on this site I can't. If you have a widetrack axle you don't need the shock hanger, it should be on the top of your axle.

I'm just to the point in my rebuild that I am putting the frame back together. I've mocked everything together once but now it's all powdercoated I'm putting it together for good. When I get enough post's I can add photos.

here's a link to the shacle hangers http://www.mountainoffroad.com/_e/de...le_Hangers.htm

1984 CJ7 - Under construction
4.6L stroker with MPI & AX15 with D300
OME 2.5" YJ springs
http://www.jeepforum.com/forum/f8/dans-downunder-84-cj7-build-1299387/

Last edited by dan-cj7; 10-29-2011 at 01:16 AM. Reason: added link
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post #13 of 14 Old 04-25-2016, 10:35 AM
sarch65
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CJ to YJ Suspension Conversion

I am just beginning my 1986 Reno. and wondering what is the best setup for the money on the conversion from original CJ suspension to YJ. I know the guys at Rocky Road want $1,000 for their setup but is there another good option for a little less $$ ? If so, can you give me the setup? Thanks!
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post #14 of 14 Old 04-25-2016, 01:46 PM
acgcoug
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Quote:
Originally Posted by sarch65 View Post
I am just beginning my 1986 Reno. and wondering what is the best setup for the money on the conversion from original CJ suspension to YJ. I know the guys at Rocky Road want $1,000 for their setup but is there another good option for a little less $$ ? If so, can you give me the setup? Thanks!
Quote:
Originally Posted by sarch65 View Post
I am just beginning my 1986 Reno. and wondering what is the best setup for the money on the conversion from original CJ suspension to YJ. I know the guys at Rocky Road want $1,000 for their setup but is there another good option for a little less $$ ? If so, can you give me the setup? Thanks!
There isn't a cheaper option other than fabricating the hardware yourself and buying new OME springs individually (about $104 each), or used ones off a YJ. Just over $400 for new springs isn't that much IMO, so I think it's wiser to go that route.

You can pick and choose parts with Rocky Road which is a nice option, and that could save you money depending on what you need for your Jeep. I excluded the brakes lines and t case drop in their kit. Although I will be ording SS brake lines so I'll actually be spending more there.

I'm not sure if they are offering shocks anymore, as I had to cancel that portion of my purchase. That saved me around $140, but I ended up buying new Black Diamond shocks for something like $160.

All in all, I think I spent around $720 shipped to my door by RR.

4 Springs and just their conversion kit = around $580 before shipping. That's a great deal IMO.

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