I love the amount of height I gained (1"-1 1/2") by adding longer shackles. A couple of weeks later though I started to notice slight driveline vibrations which got worse over time and led to broken u-joints and lots of frustration. The shackles were built by a guy a Serious Metal and are three inch longer than stock. They cost $150. Cheap for 1 1/2 inches of lift but factor in the cost of fixing my drive angles and it was not worth it. $600 plus a CV driveshaft($275) plus new mufflers-$150(after getting bashed by flying driveshaft). So nearly $1200 for an inch and a damn half. Think about the chain before you do this mod.
Ps. In comparison, I just ordered a Rubicon 4 1/2 inch Extreme Duty with everything include for $1500
80 Cj5, 360amc, Swampers, Custom 5in. lift, Off Road only
92 XJ 6" Rubicon, 32s, strictly street
The biggest problem with shackle lifts is they knock out your caster. Meaning your steering knuckles lean back towards the rear. when you do a shackle ift that changes. They lean more to the front, which in turn can make steering feel like you have lots of weight in the back. If you are looking for lift [cheap] try an add a leaf good for about 2" maybe. Or for around 500 you can put in 2.5 inch lift springs but then you have to change shocks. Wheeling is not cheap, I have found out first hand. All those little things add up. ie broken u-joints. I would wait or see if you can get a used lift from someone. I have been toying with the idea of a shackle reversal and making everything a inch loger for a true 1 inch lift.
my 0.02 cents
92yj d44 front& rear.4.09
mazda 626 seats
2.5 susp lift 3" body
revolver shackles coming
with motor swap..
i installed a 1 1/2" shackle lift in my toy, meaning that the shackles are 3" longer than stock. i had to install a 4degree shim to keep my u-joints at proper angles. i don't know that much about jeep suspensions but couldn't you use a shim as well? they also say that for best results longer shackles should be used in conjunction with lifted springs
when in doubt, hammer the gas
81 toy 4.5-5"lift, rebuilt 22r, homebuilt bumpers, 33 mud kings JDgreen, 4.37's
My first lift was a 1.25" shackle lift. Got it from Sports Trucks Unlimited in langley. They gave me enough lift to allow for 31" tires in my YJ.
To tell you the truth, I didn't really notice any vibration problem. It may have been due to the fact that my springs were sagged a bit so it didn't truelly lift me that much over stock height. The extra ground clearance helped, but my approach angle didn't change, and I bashed my shackles into rocks quite often.
I still run my 1.25" shackle lift, but it's used with my SOA conversion now, so the approach angle issue no longer applies. Still, for a cheap lift, I would personally recommend it, especially if it will allow you to run a bigger tire. Bigger tires are the only true way to gain more clearance under the truck.