HELP needed with GMC transmission problem

My 2000 Sierra just started having a problem with a server jump from

1st to 2nd gear. When starting from a dead stop and my automatic goes from 1st to 2nd on take-off, I get a very bad jumping jerk of the truck. All other gears are good.

To get around the problem I began starting off in 2nd gear from a dead stop.

Any help is appreciated. Terry in Texas

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Terry
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Shep

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