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shift problems

  1. Transmission - Rearend
    hi i have a 96 chevy 15004wd ext cab sb with vortec 305/4l60e 188k miles, and heres the problem, when the truck is completely cold(colder outside the longer) the tranny up and dowshifts 100% beautifuly no slipping nothing its perfect for maybe 10-15 miles, then once its warmed up it completely...
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