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Hard Shifting is a good indicater that you need to have it serviced. Pull the dipstick and get the Fluid on your fingers then rub it round a bit and smell it. If it smells burn replace A.S.A.P. Here a [http://www.nationaltransmission.ca/pdf/Reading_Fluids.pdf Printable Document] I found on the subject. Good Luck and Remember.
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Q: 1997 Yukon transmission shifts hard from 1st to 2nd but not all the time?
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