The shackle lift probably tilted your axle too far forward (castor?) and now you are out of the 6 degree spec. You can use a cheap magnetic angle finder from home depot or lowes to check it. Place the guage on the lower flat portion of the lower ball joint. If you are out of spec, you can get some taper shims in the correct degree to bring it back into the zone. Learned this trick here on JF, just can't remember who to thank.
I did a somewhat sucsessful toe-in alignment on mine. I raised both front tires onto jack stands about an inch off the ground and used a sharp scribe clamped in a large pair of vise grips and held it tightly to the floor up against the tire and spun it to get a even line all the way around the tire, did this on both tires and measured the distance between those lines both front and back. Then twisted drag link until it had an 1/8" difference between front and back, with the front being toed in. Really helped with the over correction problem
CJs are not famous for hi speed use LOL