I have a 2004 Sierra ZL1 that today decided it did not want to shift into 3rd or 4th, It just revs freely. No codes, no check engine, fluid is fine, no smell. Any ideas of what to check?
Thanks,
Jack
there is no dtcs(service engine soon light) and it still occurs it sounds like possibly 3-4 clutch pack is completely worn or electrical problems but they usually set dtcs
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