91 Ls400 Transmission Clink

[flipmode64]

I have a very fast vibration i can feel in the gas pedal around 1500-1900 rpm, in ANY gear. Some days its there and some days it isnt. 85% of the time it is there though.

Owner before me had a garage trying to "adjust" the driveshaft due to this vibration. also had both the tranny and motor mounts replaced.

I am pretty sure there is an aftermarket driveshaft on the car.

I was going up a hill the other day with window down and it was holding gear at about 1700 rpm and I could hear a constant metal clanking noise that was bouncing off the curb and back in the window which i could hear, sounded like somthing was metal grinding or clinking together, which i assume is related to the vibration in the pedal.

I also notice that if i am driving slow (20-30kph) and speed up just a bit and then completely let off the gas, somthing makes a clink under the car basically where the tranmission is, which is assume is the transmission.

Any ideas what this could be, or what I could try/test?

Thanks!

[flipmode64]

nothing eh? Lexus $120.00 diagnostic fee here we come I guess.

[landar]

I would not assume that the clicking is associated with the vibration. Maybe it is but maybe not.

Now, I suppose you have thoroughly checked the universal joints on the driveshaft?

[Ancdmd]

I have a similar noise in my '02 LS430 that's been driving me nuts for 18 months. Techs and dealers have been no help. Does it sound anything like this?

[billydpowell]

I would think you could pick up a drive shaft from a salvage yard pretty cheap and try it to see if the sound changes.... or goes away.

[tron37b]

What do your rear differential mounts look like? Maybe the mount/bushing is worn and allowing the differential to bounce around??