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1970 911T 2.2 Noise Gremlin

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Vehicle Information: Model: 911T 2,2 ; Year: 1970; Body Type: Coupe; Engine (type, size, modifications): 2,2 six cylinder; Total Mileage: 137,000;

My 1970 911T has an oscillating high/lownoise originating from the underside of the vehicle only when driving over 30 mph.Sort of like a police siren. My front brakes/tie rods were repaired recently- and this seemed to reduce the noise. The noise occurs about 30% of the time...especially when first "starting out". The noise is consistent with the speed of the car, or, revolution of perhaps the wheels and not the RPMs of the motor or gear positions.I may "tape-record" the noise for my mechanic- any ideas? Thanks!

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