Steerin wheel shake at speed
 

Recently my steering wheel has begun to shake at speed with a slight warbling sound from under the car. Below 50mph everything is smooth but at or above 50 the steering wheel shakes in my hand. I started cheap and had all 4 wheels rebalanced and the problem persists. My next thought is wheel bearings beginning to wear. Before I start pulling the car apart and spending extra money I wanted concurrence from others with more experience. Is there another route I should be going or a cheaper trouble shooting step I can take. My car is a 93 S13 on BC coils. All suspension parts are tight, aligned and have less that 10K miles on them so I have not investigated anything else being the culprit.

Check the tie rod ends. I had one go bad and it caused a shake at highway speeds.

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how is your toe?

90% its your tierod ends one is probably loose or damaged.

steering shaft bushing?

tie rod ends or ball joints is the most typical to go out.

Same issue here. Replaced inner and outer tie rods, all else is tight. Next move is going to be rotating the tires to see if the shake moves, determining if it's a bent wheel or bad tire.

Thanks
 

I'll put the car up tonight after I get off work and check the tie rods. While I have the car up I'll rotate the tires and see if there is a change. At least those things are free. I appreciate the feedback and will report what happens.

you need new lower control arms and tie rod ends. sounds like all of your bushings and ball joints are shot. its easier to swap in new arms then to try and press out bearings and balljoints and then press now ones in. adding coilovers to any car with bad ball joints and bushings only adds to the problem over time and makes things worse given the dampers and springs on coilovers add more abuse to an already abused part due to their stiffness and inability to absorb road bumpers and inconsistencies.