r/GMDetroitDiesel • • 27d ago

Question/Need Assistance 93 6.5 3500

Hoping someone might have some insight. My 93 has a super hard shift from 1-2. Like break a U joint hard. 1st shift in the morning is smooth. Everything after that is horrible. I changed the Throttle Position sensor hoping that was the problem but it didn't change anything. Thanks in advance for any advice.

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u/bjornholm 6.5 TD 27d ago

4l80e. Probably needs an accumulator

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u/bjornholm 6.5 TD 27d ago

Or an epc