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Sportomatic clutch engagement

Transmission

Vehicle Information: Model: 911T; Year: 1973; Body Type: Coupe; Engine (type, size, modifications): 2.4 upped to 2.7 and high compression P&C; Total Mileage: unknown;

On an upshift the clutch does not engage now and then. No consistent pattern, except on the upshift and in all gears. If you wait a full second between taking your hand off the lever and applying throttle, the clutch engages. I plan to AX this car and don't like the waiting around. Wks well in all other respects. There was difficulty shifting at first, but my mechanic tore down what I believe is a vaccum control valve, and it now shifts fine. Any ideas? Bob, and thanks again.

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