Pannicthrottle Posted May 19, 2018 Share Posted May 19, 2018 Could some one please explain? Which way is better and why. Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
Griff04 Posted May 19, 2018 Share Posted May 19, 2018 That’s opening up a “can of worms”...I’ve had both. I’ve installed the SUA standard suspension lifts but never the SOA. The one Jeep that I did own with it, actually purchased it with the SOA already set up on it, it sat up high and rode pretty rough, didn’t keep it long. From what I’ve read there’s so much geometry that comes into play when doing a SOA you really have to know what you are doing to get it right. Just google SOA vs SUA and you can read on for days and days. Sorry man, not much help Griff Link to comment Share on other sites More sharing options...
Swampy Posted May 19, 2018 Share Posted May 19, 2018 The basic difference is with sua the leaf springs sit under the axle and with soa the leaf springs sit on top of the axle. With soa you get more lift cheaper but you have to set your pinion angle correctly or you are going to have problems with your driveline. With sua it is better for keeping your center of gravity low. Link to comment Share on other sites More sharing options...
Pannicthrottle Posted May 19, 2018 Author Share Posted May 19, 2018 So basically I have a Dana 35 soa from my 96 xj and a Dana 35 sua from. My mj. My plan is to install my Dana 30 with a 3inch lift. From my xj And then try to level it out in the rear with the parts I have off the xj I have already split the leafs and installed the helper springs from the xj in to the Comanche leaf pack. I can cut.and weld the Perchs but I'm worried about the pion angle I have never had to deal with that be for. Side not the sua seem to be sezed. Would it be better to swap internals and keep the soa setup? if so can that be done? This truck will be a DD that probably won't see any off road action at all.Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
Jeep Driver Posted May 19, 2018 Share Posted May 19, 2018 1 hour ago, Pannicthrottle said: So basically I have a Dana 35 soa from my 96 xj and a Dana 35 sua from. My mj. My plan is to install my Dana 30 with a 3inch lift. From my xj And then try to level it out in the rear with the parts I have off the xj I have already split the leafs and installed the helper springs from the xj in to the Comanche leaf pack. I can cut.and weld the Perchs but I'm worried about the pion angle I have never had to deal with that be for. Side not the sua seem to be sezed. Would it be better to swap internals and keep the soa setup? if so can that be done? This truck will be a DD that probably won't see any off road action at all. Sent from my Pixel 2 XL using Tapatalk Not a good plan. Link to comment Share on other sites More sharing options...
Pannicthrottle Posted May 19, 2018 Author Share Posted May 19, 2018 Well why not??Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
Jeep Driver Posted May 19, 2018 Share Posted May 19, 2018 If all you want is 3", forget SOA. D35 is junk, chuck it. Set up your rear first then level out with the front, not the other way around. OME springs in front will give you nearly 2", then use pucks or ACOS. Pinion angle is parallel to trans........likely about 4 degrees up. Link to comment Share on other sites More sharing options...
Dzimm Posted May 19, 2018 Share Posted May 19, 2018 If you don't plan on using it offroad than keep both Dana 35s so when the MJ one finally dies, you have the XJ one as a spare. They aren't very strong axles but if you take care of them (minimal offroad and no burnouts) you should be okay. They have blown up just from street driving though. This will save you tons of money up front and if you just blow up the gears or an axle shaft, you don't have to swap the whole axle, you can just swap the spares from the XJ axle. But if you plan to actually wheel it later on, or don't want to deal with it when the axle breaks, because it will eventually, then swap it with something better like a C8.25. As for SOA, you will immediately get 4-6 inches of lift so it's not ideal for you. It also introduces axle wrap, which is when the leaf springs make an S shape due to the forces of acceleration and can seriously change the ride quality. Pinion angle is also very important. SUA retains the factory geometry and creates almost no axle wrap. I would recommend reading up on these on Google as there is tons of info on it. Just keep it a generic search for SUA vs SOA so you get real info and not forum junky's opinions. You are best off doing add-a-leafs, bastard pack, or just getting new lift leafpacks to get the rear to your desired 3" and then leveling the front to match as Jeep Driver said. Fine adjustments to lift is way easier to do up front. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 20, 2018 Share Posted May 20, 2018 22 minutes ago, Dzimm said: As for SOA, you will immediately get 4-6 inches of lift so it's not ideal for you. It also introduces axle wrap, which is when the leaf springs make an S shape due to the forces of acceleration and can seriously change the ride quality. Pinion angle is also very important. Forces of acceleration? The OP has a 2.5. Link to comment Share on other sites More sharing options...
Dzimm Posted May 20, 2018 Share Posted May 20, 2018 7 hours ago, HOrnbrod said: Forces of acceleration? The OP has a 2.5. Lol good point. Link to comment Share on other sites More sharing options...
Pannicthrottle Posted May 21, 2018 Author Share Posted May 21, 2018 Well with all this wonderful knowledge i have just received both from here and the Google i will be going back to the soa set up and adding some ho.e made shacklesSent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
Dzimm Posted May 22, 2018 Share Posted May 22, 2018 4 hours ago, Pannicthrottle said: Well with all this wonderful knowledge i have just received both from here and the Google i will be going back to the soa set up and adding some ho.e made shackles Sent from my Pixel 2 XL using Tapatalk Just out of curiosity did you mean sua? Link to comment Share on other sites More sharing options...
Pannicthrottle Posted May 22, 2018 Author Share Posted May 22, 2018 Yes i did Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
Dzimm Posted May 22, 2018 Share Posted May 22, 2018 54 minutes ago, Pannicthrottle said: Yes i did Sent from my Pixel 2 XL using Tapatalk Just checking. I was a little confused. Link to comment Share on other sites More sharing options...
Pannicthrottle Posted May 22, 2018 Author Share Posted May 22, 2018 I will post some pictures as soon as.i start should have xj control arms today i am going to finish the front and then just figure out the rearSent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
GrizzzzBear Posted June 1, 2018 Share Posted June 1, 2018 You NEED to Remember, The MJ Leaf Springs ARE NOT the Same as the XJ. MJ has Longer and Heavier Capabilities, compared to the XJ. Length and Axle Location are Both DIFFERENT!!!! Link to comment Share on other sites More sharing options...
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