transmission drags in first gear after having the transmission flushed on 1997 Oldsmobile LSS

this started 3 weeks ago when I had the transmission flushed

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Asked by for the 1997 Oldsmobile LSS
Ok, first thing out. You NEVER do a 100% fluid change on ANY transmission EVER. The clutches cant stand the drastic fluid change all at once. You must do a 40% change at first. If problem persists, remove another 5% thereafter. This will allow the clutches to get use to the new fluid viscosity.