Took my volvo 240 DL '86 into a shop to get tires replaced. The first place told me to fix the ball joints before I could get it alligned. Second shop told me the same. However, the first shop also tried to sell me on new shocks, while the second tried to sell me on a new steering shaft u joint. How can I tell if I actually need these things. I have not noticed any particular problems with either suspension or with steering, although the steering is slightly stiff (although not out of the ordinary I would think for an old car.)

Thanks