1996 Paseo. Auto gearbox seems to be slipping at high revs. why is this? on 1996 Toyota Paseo

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Problem occurs in reverse also, doesn't seem to be engaging the gearbox well. Feels like its slipping. car has not been serviced for a long time though.. does the gear box need a complete overall or is it another problem. thanks
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yep no worries. Ive noticed when it warms up the problem becomes a lot less. is that normal for a gear box problem?