I have a 2005 5.3 , and a while back all of a sudden it wouldn't shift into 3rd gear. By changing the transmission oil, do you think that's a good idea?
In my experience in which I tryed before changing the transmission fluid after it does not change gears does not work.
It stays in 2nd or just revs?
Stays in second, then after you keep stepping on the gas, itll just rev.
If it shifts from 2nd and just revs like it's in neutral then your trans is done and will need a rebuild
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