Sc 400 Vibrations

[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?

[Sluggo]

I had a coast-down vibration problem between 35 and 30 mph. Turned out to be a tranny mount, which is apparently a not-uncommon problem in these cars.

PS Mine also a 92 SC400 with about 130k on the clock.

[Orlousy]

sounds just like the problem I have been having, I actually have an appt scheduled for later this week to look at it.

My problem occurs right around 40 mph, when I am hard on the gas, I notice nothing, but only when I real soft on the gas, that's when I notice it. Very annyoing!! I was thinking it might CV joints as well, but my understanding is that a rear wheel drive car doesn't have CV joints.

In any case, once I take my car in, I will post what the problem was.

[JamesN]

It could be the control arm bushing. Our LCB usually give out at 130K miles. So check for that.