Sc 400 Vibration Problem-help!

[dan83]

hey all this is my first post, just got a sc 400 yesterday. here are the specs and problems so far:

1992 lexus sc 400

129k

timing belt changed at 67k ( but in 1997 i might add)

tires are worn badly

MOST SEVERE PROBLEM: Shakes BADLY at 70-75, when not accelerating, let me explain.

It does NOT vibrate when revving in neutral when not moving, does not vibrate when accelerating hard from 0-85, BUT, if i take my foot off the pedal from 65-75, the car starts shaking quite badly, and the shifter rocks backand forth maybe 1/2" 1".

Any advice?

I am suspecting either C/V joints in the rear axles, transmission mount, less likely but possibly engine mount, and/or drive shaft C/V joint?

HELP!

thanks a lot

dan

also, where is the best place to buy parts like these?

[SHAHZ]

as youve said the tyres are badly worn and its done 129k, get the tyres changed and wheels balanced and see how it goes from there

[Chris.S]

Check the sidewalls of the tyres, both inner and outer. If these become mishaped it can give vibration throughout the car

[mrdsukautos]

Yip as above get the tyres changed and wheels balanced Plus get the geometry set up again as well ive just posted the geommetry settings on another post today.

Let us know if there are any further problems and ill give you the further fixes if that does not cure the vibrations

Also get the timing belt done as well it is at the better to be safe than sorry point of its life!