2.5 inch shackle lift? yes or no?

I've considered putting longer daystar shackles on my 72 CJ5 and I was wanting some input from you guys on the shackle lift route. Was hoping for some input possibly from those of you who have tried it. I've read good and bad things about it. The jeep will be on trails rarely and will mostly be driven on the road. It won't be a daily driver, just a weekend type mobile. Let me know what you guys think.

 

its actually the 2 1/4 not 2 1/2

 

Since you are moving only 1/2 the spring down, shackle lifts only net 1/2 the height they are lengthened.

So as w3srl has said, 2.25 (over stock) = 1.125 worth of lift.

This will also move your camber (or caster but it's balljoint tilt) closer to 0, sometime it is OK other time death wobble will show up.

 

Extended shackles bad. Lift springs good.

 

It will primarily effect caster. The other effect will be Steering Axis Inclination, not camber.

Camber is in a nutshell the top of the tire/wheel in towards the vehicle (negative camber) or away from the vehicle (positive camber).

You are absolutely correct that it will effect caster. If you draw a line through the upper and lower pivot points at the ball joints or trunnion bearings is the caster angle when measured front to rear from the vertical, vertical being 0*. Tilt rearward is positive caster and tilt forward of 0* is negative caster. This angle determines stability at higher speeds but if too much can cause harder steering at slower speeds.

 

A 2-1/2" to 4" spring lift benefits from shackles maybe 1" longer than stock because it allows the longer arched springs to flex further before running out of room to grow, but IMO they are NOT a good idea for achieving lift. Especially for a road rig.