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No 3rd or 4th

2K views 1 reply 2 participants last post by  mctabeling 
#1 ·
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
 
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