Hi all. My transmission (auto) is giving me problems. It won't upshift unless I redline it (and even then it struggles) and then won't downshift afterward. Needless to say I stopped driving it so I won't kill the tranny. Any suggestions/causes? The only transmission work done was to replace the cooler lines (not the hoses). Am I looking at replacing it? Thanks for your help.

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1984 300TD Turbo 156Kmi
"He who seeks knowledge begins with humbleness" - Buju Banton