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transmission slow to shift

astro van with automatic transmission when starting off it doesn't want to shift on its own. i have to manipulate it to shift with the accelorator. at about 22mph i let off the accelorator slightly and it shifts to the next gear


  • edited January 2011

    Model year?
    Engine type/size?
    Odometer mileage?
    Maintenance history of the transmission?
  • edited January 2011
    Does the problem clear up once the engine is at operating temperature?
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