I have a 1989 comanche, 2wd with a 4.0L. I just replaced all of my tie rods and was told that they cannot give me an alignment until I get new ball joints, (my current ball joints are original and he said over time they have sagged, I can believe that) the mechanic strongly suggested if I replace the upper to go ahead and replace the lower, also he said I need to get adjusted NOT FIXED ball joints. Does this sound correct? because adjusted are a lot more expensive. Thanks.