Transmission slipping at low speeds and start from stop

The can filter was changed cause I thought it was due to worn fluid and clogged filter it was jerking till I got speed p to 40-45 after that it dont happen till I slowed down. I went to parts house they say it has a secong filter inside trans with, but couldnt tell me where it is. I check with local trans shops and they dont work on them I am in waycross ga. How do I change inside filter or do you think jerkng is another problem. Dealer wants too muck to check it out so thats out
pleae help me with this issue asap my wife drives it t work.