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I disagree whith the exaust theory.... not saying that it doesnt exist... it very much does does . I just do not think that from what you described that that is what it is. You said that it was intermitant and sounded like metal dragging. That to me, sounds like a bearing going out. I cant say which one, but from the description you gave, that was my first thought thought. the other thing I thought of next was the rearend.... is it leaking? check the fluid level and while you are there, might as well replace it... Rearends make a squeeling noise sometimes when the go too.
I have had a SAD go bad on me too... and it makes more of a knocking sound.... ( i got a previa super cheap one time cause the "mechanic" thought that the engine had a bad knock. I bought it from him, spent $70 on ebay for SAD bushings, 4 hours later had a smooth as snot running van"....
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1991 Previa (lexus EGG 240) 5 speed manual trans, white, fact. spoiler, 18" nissan wheels, nice tint, dvd front and back, Rear end from S/C donor
1995 "FrankenYota". S/C dual roof being converted to 5 speed Alltrac.lifted 2 inches,
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