Need expert suspension troubleshooter - shaking steering wheel

[Jim_A_B]

I replaced my '91 240SX's shocks/struts and I replaced the worn out bushings in the tension control rods with the hard eurothane performance type. I also replaced the tie rod ends. I got an alignment today. The car was pulling hard to the left, but it rolls straight now. The steering wheel was shaking bad at about 50+ mph. Now it shakes, not bad, but more than it should at about 70+ mph. I'm thinking either the wheels need balancing (but I just had them balanced not too long ago) or else something else in the front suspension is worn out. The steering is responsive, but seems a little loose on center (understand?). I'm super cheap, but I want to fix this. Other than getting ANOTHER balance, what else can I do for free (DIY)? What else should I check? I imagine the alignment guy just set everything at factory specs. Should I try increasing toe-in by 1 turn of the tie-rod end? Could the stiff eurothane bushings be messing up the caster?

[robbbby]

I'd take a look at the rack bushings.

[98s14inaz]

Well first off your tires might have flat spots. No matter how you balance them they will shake the car. Rotate them back to the rear for a while. Second replace your ps fluid and make sure there is automatic trans fluid in there and not ps fluid. I know it is confusing but it is factual. Worn out fluid can cause a shimmy at highway speeds. You are going to feel more vibrations with the urethane, nothing you can do about it.

[Jim_A_B]

Thanks! How do I remove the PS fluid? I imagine it is original! Any certain type of ATF I should use? I knew the performance bushings would give me a harder "feel" through the steering wheel, but they wouldn't make the steering wheel shimmy back and forth would they? I'll move the front tires back to the rear tomorrow. Should I mess with the toe-in? On my old Ford truck, there was a screw you could tighten on the steering "box" that would cause the worn gears to mesh tighter. Does the '91 240SX have something like that?

thanks!Jim

[98s14inaz]

I guess that dexron/mercon stuff. Remove one of the hoses with the car off. and put a container under the resivior. Put the end of the hose in the container too. Have some one turn the wheel a few times until you get most of it out. then turn the crank a few times by hand and repeat. Reattach hose, refil resivior and turn wheel until the level goes down and refill. turn crank by hand a few times and repeat until it is full and doesn't go down any more. there might be a better way of doing this but this is the way i did mine.

[98s14inaz]

Don't mess with your alignment or tweak anything. Leave it to the professionals or you will regret it.