Whats up with my steering system??

[S13_RB25]

Hey guys long story short, I sprayed some engine degreaser towards and around the oil pan! And after I washed it off and what not, it sat for the night, drove it next morning and my steering wheel started to shake around 23mph to 25mph! After and before that point its fine. Also what I mean by the shaking is up and down type movement. Its more of like a vibration, I guess the best way to describe it. On a side note when I pushed down on the front two struts, from the fender, the driver side one is stiffer compared to the passenger one! Would that have anything to do with the steering shaking?? I know it sounds like a noobish question but im pretty sure that is also is causing the drive shaft to get most of the vibrations!

Also it is a 93 s13 with PU motor and trans mounts! No modifications are done to the suspension! So what can cause these vibrations???

[costa_rican13]

tie rods for the steering wheel wheel, and the drive shaft carrier bearing going out is probably the reason for shaft vibrating

[S13_RB25]

Well I know the tie rods are worn, the outer ones, but the vibrations began after I used the degreaser. My steering is loose and that's caused by the outer tie rods, checked them in my lab class at my college. So is there anything else i can check related to the steering?? As for the drive shaft, would, the metal piece that bolts to the chassis on the center bearing, being bolted upside down cause it to vibrate???