Ok
There is a common code for the upshift delay fault and if that is the code they found, then the most likely remedy is to change the kick-down cable and Vac Element ..very common...it is outside the trans and the cable sticks or the vac element no longer holds vac b/c the element leaks ...the part is listed for your chassis at the Parts Section of this Forum, but that site does not seem to be working today...maybe try it later. [ top of page]
Print that out and ask your guy if that is the code he is concerned with.

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A Dalton