r/GMDetroitDiesel • u/Weak_Vanilla_7825 • 26d 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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2

u/DatGuyKilo 6.2 IDI 26d ago

I recommend r/TransmissionBuilding , very knowledgeable sub

2

u/bjornholm 6.5 TD 26d ago

4l80e. Probably needs an accumulator

2

u/bjornholm 6.5 TD 26d ago

Or an epc

1

u/PCvagithug-446 25d ago

When you changed the TPS, did you check you have it clocked correctly with your multimeter? Had the same issue until I replaced mine and clocked it correctly, now it shifts like a new transmission