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I have a 93 ls400, 135,000, when I kick it in passing gear and rpms get above 3000, I get this rythmic vibration in transmission area, the same thing happens if I am going down a long hill and I down shift to low, rpms go over 3000 and I get this terrible vibration like a bad u joint or torque converter or what else could it be???????thanks

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I had a similar problem with my 91 LS400. When I accelerated, I had a vibration. I thought that this was an ignition miss, so I had the spark plugs replaced. It made no difference.

I then installed 4 new tires and the vibration went away. Go figure why the tires only causes a vibration under acceleration? Anyway, new tires fixed the problem.

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