MrSimon Posted March 9, 2009 Share Posted March 9, 2009 I recenlty installed the adjustable lift shackles from Rough Country. Is the angle ok? Its steeper than stock. I am inclined to leave it alone as I'm happy with the lift and the ride seems un-affected. Is there anything I should be concerned with? Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 9, 2009 Share Posted March 9, 2009 I recenlty installed the adjustable lift shackles from Rough Country. Is the angle ok? Its steeper than stock. I am inclined to leave it alone as I'm happy with the lift and the ride seems un-affected. Is there anything I should be concerned with? A little steeper than mine, but looks okay. I have the Tearflex shackles. Image Not Found Link to comment Share on other sites More sharing options...
89eliminator Posted March 9, 2009 Share Posted March 9, 2009 I'm pretty sure you want the shackle to be as close to a 45* angleas possible here are mine Link to comment Share on other sites More sharing options...
Geonovast Posted March 9, 2009 Share Posted March 9, 2009 Looks like he's running SUA yet though.. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted March 9, 2009 Share Posted March 9, 2009 yes they're fine. when you flex, they'll pull down and it may have a tendency to bind when compressing after full flex on the droop side, but it will correct itself. they'll work just fine. Link to comment Share on other sites More sharing options...
Eagle Posted March 9, 2009 Share Posted March 9, 2009 I'm pretty sure you want the shackle to be as close to a 45* angleas possiblehere are mine It depends on whether it's spring under or spring over, and how flat the springs are. For a typical spring-under, like a stock MJ, there's a lot of arch in the spring. The shackle should be basically vertical, because when the spring compresses it gets flatter and longer, and when it droops it needs to pull the shackle forward. In a SOA like a stock XJ, the spring is basically flat at rest. It can't get any longer, so the shackle can/should point back. The spring arches more and gets shorter whether the suspension compresses or droops, so the shackle will never need to swing farther back. Link to comment Share on other sites More sharing options...
dakal Posted March 10, 2009 Share Posted March 10, 2009 go to http://www.afcoracing.com/tech_pages/leaf.shtml and look at leaf spring tech. helped me! :D Link to comment Share on other sites More sharing options...
MrSimon Posted March 10, 2009 Author Share Posted March 10, 2009 For a typical spring-under, like a stock MJ, there's a lot of arch in the spring. The shackle should be basically vertical, because when the spring compresses it gets flatter and longer, and when it droops it needs to pull the shackle forward. This is a great explanation - thanks!! I am SU with new leafs with plenty of arch so it seems I'm right where I should be. Link to comment Share on other sites More sharing options...
Eagle Posted March 10, 2009 Share Posted March 10, 2009 I am SU with new leafs with plenty of arch so it seems I'm right where I should be. Looks that way to me. Link to comment Share on other sites More sharing options...
TrailReadyMJ Posted March 11, 2009 Share Posted March 11, 2009 For a typical spring-under, like a stock MJ, there's a lot of arch in the spring. The shackle should be basically vertical, because when the spring compresses it gets flatter and longer, and when it droops it needs to pull the shackle forward. In a SOA like a stock XJ, the spring is basically flat at rest. It can't get any longer, so the shackle can/should point back. The spring arches more and gets shorter whether the suspension compresses or droops, so the shackle will never need to swing farther back. Sorry, but I'd have to dis-agree with this... SOA or SUA, the static arch of the spring is the same no matter where your axle is. Same goes for the general rules as far as travel of the spring pack. No matter what your application is, you will get the best performance with around a 45* shackle angle. The ride won't get real bad until you have a negative angle, it's just the straighter the shackle, the less droop you will have. Link to comment Share on other sites More sharing options...
dakal Posted March 11, 2009 Share Posted March 11, 2009 read the article @ http://www.afcoracing.com/tech_pages/leaf.shtml under leaf springs........... really. :papers: Link to comment Share on other sites More sharing options...
Car RamRod Posted March 11, 2009 Share Posted March 11, 2009 Well atleast if you have to take it out, there shouldn't be a rust issue on the bolts. Link to comment Share on other sites More sharing options...
Eagle Posted March 11, 2009 Share Posted March 11, 2009 Sorry, but I'd have to dis-agree with this... SOA or SUA, the static arch of the spring is the same no matter where your axle is. Same goes for the general rules as far as travel of the spring pack. No matter what your application is, you will get the best performance with around a 45* shackle angle. The ride won't get real bad until you have a negative angle, it's just the straighter the shackle, the less droop you will have. Ever look at an XJ spring? It's flat. MJ springs are arched. It DOES make a difference. Link to comment Share on other sites More sharing options...
TrailReadyMJ Posted March 11, 2009 Share Posted March 11, 2009 Ever look at an XJ spring? It's flat. MJ springs are arched. It DOES make a difference. Yeah, I have an XJ and wheeled it to it's death... You are comparing XJs to MJs.... I was comparing SUA to SOA, with the same springs, sorry for any confusion. All I'm saying is just moving the axle doesn't effect the arch of the spring, so SUA or SOA are not relevant to your shackle angle. You are correct that the arch of the spring has an effect, just not the axle position. PS: XJ springs aren't flat, but they do have very little arch at ride height. Once they sag (like most you see now) they are pretty much flat. Link to comment Share on other sites More sharing options...
TNT Posted March 12, 2009 Share Posted March 12, 2009 I'm pretty sure you want the shackle to be as close to a 45* angleas possiblehere are mine I relocated my upper shackle mounting hole to increase my angle. It made a noticable difference in ride and flex. I could fully flex 16" travel shocks. Now I just need some... Image Not Found Anything less then 15 degrees will ride harsh because the spring causes the body to need to rise over bumps. Link to comment Share on other sites More sharing options...
TNT Posted March 12, 2009 Share Posted March 12, 2009 Greaseable shackle and rear spring eye bushings help flex and ride with the proper shackle angle. This will allow the spring to flex freely. Keep the front spring eye rubber to absorb road shock and impact forces. Link to comment Share on other sites More sharing options...
Eagle Posted March 12, 2009 Share Posted March 12, 2009 All I'm saying is just moving the axle doesn't effect the arch of the spring, so SUA or SOA are not relevant to your shackle angle. You are correct that the arch of the spring has an effect, just not the axle position. PS: XJ springs aren't flat, but they do have very little arch at ride height. Once they sag (like most you see now) they are pretty much flat. Except that in stock form, most SUA springs have significant arch and most SOA springs sit basically flat. And XJ springs don't have arch. If anything, the rear tip arches DOWN, not up. They are, for all practical purposes, flat when installed in a vehicle, and that's what counts regarding which way the eye has to move when the suspension compresses or droops. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 12, 2009 Share Posted March 12, 2009 I relocated my upper shackle mounting hole to increase my angle. It made a noticable difference in ride and flex. I could fully flex 16" travel shocks. Now I just need some... Image Not Found Anything less then 15 degrees will ride harsh because the spring causes the body to need to rise over bumps. Interesting Tim. No room to re-hole on mine w/o changing the spring mounting plates; mine are different than in your pic. That an XJ? Image Not Found Link to comment Share on other sites More sharing options...
LEAD_NOT_FOLLOW Posted March 12, 2009 Share Posted March 12, 2009 Don thats the difference between the SWB and LWB mounts. Link to comment Share on other sites More sharing options...
mvusse Posted March 12, 2009 Share Posted March 12, 2009 Looks like a Comanche to me. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 12, 2009 Share Posted March 12, 2009 Don thats the difference between the SWB and LWB mounts. Ah, I remember now about the mounts causing problems when I tried to install a rear MJ sway bar that was designed to fit the SWB. Thanks Motion for ringing my bell! :cheers: Link to comment Share on other sites More sharing options...
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