camo89 Posted May 12, 2008 Share Posted May 12, 2008 ok so my MJ is way tall in the front and as i didn't build it and the guy who did has since passed away i want to lower it don't really want to cut coils so if a few of you with 4 6 and 8 " coils can measure them with the truck sitting n them i can see what i need to order Link to comment Share on other sites More sharing options...
Motion Offroad Posted May 12, 2008 Share Posted May 12, 2008 Coil length/height is somewhat irrelevant. It's based on the coil spring rate the coils are. For instance a RE 3.5" coil and a RE 4.5" coil are only 1/8" difference in length; however they do lift a full 1" between the two. No two manufactures run the same coil spring rates. The only real way to tell what size coils you have is to find a common point (most measure flare) and than compare it to stock. Link to comment Share on other sites More sharing options...
camo89 Posted May 12, 2008 Author Share Posted May 12, 2008 thanks Motion i under stand all to well about spring rate i think i need about an 8 " coial Link to comment Share on other sites More sharing options...
Motion Offroad Posted May 12, 2008 Share Posted May 12, 2008 A 8" long coil or a 8" lift coil? What size tires are you trying to fit? Link to comment Share on other sites More sharing options...
camo89 Posted May 12, 2008 Author Share Posted May 12, 2008 there is no trying to fit it all ready has 38s it just has to much lift in the front id like to lower it a lot il thinking about 4" in the front how ever its ard to tell i will be swaping in dana 44s front and rear so it will handel the rubber Link to comment Share on other sites More sharing options...
Eagle Posted May 12, 2008 Share Posted May 12, 2008 Measure from the center of your front hubs to the bottom edge of the flares. That's your reference dimension. Take out your front coils and cut a half coil off each spring. Put 'em back in and measure again. That probably won't drop it as much as you want, but it'll give you an idea how much drop you'll get per coil. Just remember that when you cut, the spring gets stiffer. If the coils are 1" apart, cutting one coil probably won't drop it a full inch. Measuring someone else's coils won't help you much. Coil spring rate is a function of a complicated formula that includes the free length of the spring, the number of coils, the diameter of the wire and the diameter of the coils. I don't have the formula in front of me, but one of those variables in the formula is to the 4th power. If any factor of another spring is different from yours (wire diameter, for example), comparing them is a waste of everyone;s time and effort. Link to comment Share on other sites More sharing options...
camo89 Posted May 13, 2008 Author Share Posted May 13, 2008 i guess i should have worded my first question diffrent i don't want to cut these coials down i need to figure out how much lift i need to level this darn thing out its a 89 comanche with stock mj leafs soa with a 2" block i guss i was wanting the mesure ment from the coial mount to the top of the coil mount at rest if there is a easier way i am all over it ok here is waht i have from the ground to the bottom of the flair 48" from the center of the hub to the bottom of the flair 30" approx if this help i can get more mesurments Link to comment Share on other sites More sharing options...
camo89 Posted May 13, 2008 Author Share Posted May 13, 2008 mabie this will help Link to comment Share on other sites More sharing options...
LEAD_NOT_FOLLOW Posted May 13, 2008 Share Posted May 13, 2008 Measuring to the bushwackers isn't much help as you have to trim to fit the BW's and not many people on here run them. Measure from a common point (like the tip on the fender above the light). Going SOA in the rear a 6.5" coil is typically used and it looks fairly level. I'd say if you have a 2" block plus SOA in the rear you'd need a 8" coil in the front to make it level. However it depends on the condition of the rear packs and if they were 2wd or 4wd packs to begin with. It looks like you have plenty of room. Why not remove the blocks in the rear and just run a 6.5" coil in the front and lower the center of gravity a bit and have a much more stable and capable trail rig? Link to comment Share on other sites More sharing options...
camo89 Posted May 13, 2008 Author Share Posted May 13, 2008 58.5 to the top of the hood ya its pretty tall i will mesure the top of the hood and the body line the rear has 2' block that i will remove but when i fix the rear shackel angle it will pick it back up the truck was orignaly a long box so the spring monts are not stock Link to comment Share on other sites More sharing options...
Eagle Posted May 13, 2008 Share Posted May 13, 2008 None of the measurements you have provided tell us anything, because any tire size other than "stock" (which could be any of several different sizes) means measurements to body parts will be affected even with no lift. If you don't want to cut the coils, what DO you want to do? Are you looking for advice on replacement springs to buy? Link to comment Share on other sites More sharing options...
camo89 Posted May 14, 2008 Author Share Posted May 14, 2008 yes i would like to purchas coials to lower and replace my current coials wich are to stiff dut to the fact there are a lift coial for a f150 I was wanting the mesurment of a coial installed from mount to mout. That would be the same rig to rig becous every thing else has been modified. Weight would be close on all 4.0 rigs or at least close enugh for my needs. In my mind this would have been the easies way to figure it out. I do not have aney tires that arent 38s that will bolt on the rig. If i did i would have given mesurments with them installed. i am sorry for aney missunderstanding Link to comment Share on other sites More sharing options...
Eagle Posted May 14, 2008 Share Posted May 14, 2008 Somewhere in one of my FSMs there's a description of the official, factory measurement for correct ride height. Too late to look for it tonight, but I'll try to find it for you. Link to comment Share on other sites More sharing options...
89eliminator Posted May 14, 2008 Share Posted May 14, 2008 my 6.5in coils are 18.5in from top to bottom. Link to comment Share on other sites More sharing options...
camo89 Posted May 15, 2008 Author Share Posted May 15, 2008 my 6.5in coils are 18.5in from top to bottom. thank you verry much that means to get my 20" ill need ither a 6.5 and spacers or 8" coial Link to comment Share on other sites More sharing options...
Motion Offroad Posted May 15, 2008 Share Posted May 15, 2008 my 6.5in coils are 18.5in from top to bottom. thank you verry much that means to get my 20" ill need ither a 6.5 and spacers or 8" coial We've tried to tell you that coil length is somewhat irrelevant. Measuring someone else's coils won't help you much. Coil spring rate is a function of a complicated formula that includes the free length of the spring, the number of coils, the diameter of the wire and the diameter of the coils. I don't have the formula in front of me, but one of those variables in the formula is to the 4th power. If any factor of another spring is different from yours (wire diameter, for example), comparing them is a waste of everyone;s time and effort. Link to comment Share on other sites More sharing options...
beaterjeep Posted May 15, 2008 Share Posted May 15, 2008 my 6.5in coils are 18.5in from top to bottom. We've tried to tell you that coil length is somewhat irrelevant. Just to help this along, the ZJ rear coils that I used to LOWER my '88 by 2" were 14" tall uncompressed, out of the truck. It's all about spring rates here. Link to comment Share on other sites More sharing options...
89eliminator Posted May 16, 2008 Share Posted May 16, 2008 yeah i realize that my compressed coil length doesnt really mean anything, but the original poster wanted lengths of coils in the truck and that is what i gave him :D Link to comment Share on other sites More sharing options...
camo89 Posted May 16, 2008 Author Share Posted May 16, 2008 and that is all i wanted was coial lingth with them in a rig it gives me a base to try to go from coial rate chenges the dims on a un loded coial but once you put weight on a coial it will sit at a lingth to give suck amount of lift so in this instance rate dosent mean jack all i need to know is how much approx lift i want from there i will have custom coials made but with no way of figuring out how much lift i have its really hard to do so now with getting 5 mesurments from diffrent rigs with 6.5" lift there all around 18' so if i go with a 8" coial i will get the 20' i need from mount to mount Link to comment Share on other sites More sharing options...
camo89 Posted May 16, 2008 Author Share Posted May 16, 2008 my 6.5in coils are 18.5in from top to bottom. thank you verry much that means to get my 20" ill need ither a 6.5 and spacers or 8" coial We've tried to tell you that coil length is somewhat irrelevant. Measuring someone else's coils won't help you much. Coil spring rate is a function of a complicated formula that includes the free length of the spring, the number of coils, the diameter of the wire and the diameter of the coils. I don't have the formula in front of me, but one of those variables in the formula is to the 4th power. If any factor of another spring is different from yours (wire diameter, for example), comparing them is a waste of everyone;s time and effort. for thr record i know how to couculate coial rate. however a 4.0 jeep is going to weigh about the same so rate is rate if there coial is 18" installed in the rig with weight on it and you mesure mount to mount it is the same as hub to fender or ground to fend to give you an approx lift amount Link to comment Share on other sites More sharing options...
parker454 Posted June 4, 2008 Share Posted June 4, 2008 i thought i seen where you said it has two inch blocks ? take them out that will lower your front :chillin: Link to comment Share on other sites More sharing options...
comanche87 Posted June 4, 2008 Share Posted June 4, 2008 would anyone know where i can get a set of zj front coil springs from a 4.0? Link to comment Share on other sites More sharing options...
89eliminator Posted June 4, 2008 Share Posted June 4, 2008 would anyone know where i can get a set of zj front coil springs from a 4.0? junkyard Link to comment Share on other sites More sharing options...
Motion Offroad Posted June 4, 2008 Share Posted June 4, 2008 would anyone know where i can get a set of zj front coil springs from a 4.0? Are you wanting to lift it aprox 2"? If so you want the ZJ V8 coils, not the 4.0L coils. Link to comment Share on other sites More sharing options...
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