94` K1500 Troubles

My `94 K1500 with a 350 and 153,000 mile has all of the sudden started hesitating through 1st gear and then jerking into 2nd. Had a solinoid
replaced in the transmission little over a year ago and they said everything else looked fine. Fluid was changed last with the solinoid. It went from perfectly fine to very noticable overnight. Suggestions?
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