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I am currently helping my father with his transmission rebuild for the 4l60e on a 2002 avalanche, he installed a transgo 4l60e sk shift improvement kit along with adding a corvette servo. he installed a cam on the 5.3 and the engine runs flawlessly and for the transmission he added a 3000 stall converter. the transmission will shift into reverse fine and will shift into second with using the manual shift, however the transmission will not shift into drive. the valve body has been checked over and over again and everything seems to be in place. Has anyone else had this issue or know what may cause this? Any help would be greatly appreciated!

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