98 c2500 6.5l diesel automatic wont shift into 4th

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November 5th, 2012, 9:03 PM

Jay Fava

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98 c2500 6.5l diesel automatic wont shift into 4th

my 98 that ive had for about a month will not shift into 4th. The rps stay at 3000 in 3rd truck wont go over 76mph. im really stuck on this no motor codes nothing where should i start.

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November 6th, 2012, 4:39 AM

Allan In NE

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Have you made sure the fuel and air filters are okay?

Allan

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November 18th, 2012, 11:44 PM

Jay Fava

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what would i be looking for they seem to be fine

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