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grinding could be from bad/wearing synchros (do you power shift/slam gears often?).
Slippage could be from the clutch going bad. Go about 15-20mph and put it into 5th. If your speed slowly increases but your rmp's rise quickly your clutch is bad.
You can try changing your tranny fluid to GM Sychromesh friction modified fluid as a bandaid. You have to order it a GM parts desk.
You could also try double clutching when you go into 2nd...that would kinda hide the issue.
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