I know there are all kinds of different suspensions out there for cars but im a little confused on this one. My lexus comes in either awd or rwd. As of right now tein and tanabe both make coilovers and lowering springs for the rwd version but nothing for the awd. Many people who have the awd version have used the springs or coilovers and noticed they get vibrations. Not all of them have this but its enough people. My question is, what would cause this vibration and why could you not use a suspension system from the rwd on the awd?

Im not familiar with how Lexus sets up thier AWD, but thier RWD seems to be a standard strut assembly. I assume the rear is the same in both cases, and the front is the only thing different.

I am thinking the front spindle is a wishbone for the AWD to allow for the cv to go through, and perhaps thats why they dont make an AWD kit, and people are modifying the RWD kits to fit.

We all know what happens when you "make it work" with suspension parts.

no it fits both versions with no mods which is why it has me confused

the only thing i could think of, is that vibration they are feeling is actually the AWD system acting up, similar to if you put different tire sizes on an old 4x4, the treansfer case would make noise. Or a subaru with mis-matched tires. Are they getting these bibes mostly around turns?? Any noise associated with it?

Perhaps the front axles are not meant to habdle the drop, and are straining from being at a severe angle....

just a couple thoughts....

My guess is the valving is not optimal for powering the front wheels, which might lead to noticable transcience and possibly resonance as well, which you would feel as vibrations. I could very well be wrong though.

im sure it has to do with the axle angles when dropped

grand prixs have vibration/wabble from the front end at certian drops , and fixes are lift the engine up or lower the cradle , which all changes the axle angles

the axles work best on angles , they dont like being level