silverado tachs out after warming up

Discussion in 'GM Powertrain' started by trevorwright, Jan 7, 2010.

  1. trevorwright

    trevorwright New Member

    my brother has a 91 silverado 2500 with a v8 and auto. trans. that tachs out after warming up. the truck slowly picks up speed. it slowly shifts after the rpms have been high for a while. tranny is full.
     

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