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2003 chevy trailblazer_ls_ext
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Okay so my wife has a 2003 trailblazer ext with l6 motor 4 wheel drive. She blew a tranny line last week and i spent today running new lines and fixing the leaks. So once i fixed everything refilled fluild, replaced filter. The care still has no 3rd gear. SES light is on, the car shifts fine from 1st to 2nd than once third should kick rpm jumps, if i let off i can get it to go into fourth. Also if i am running along at 40 and manually shift the car into 3rd its like its in neutral, if i put it in Drive, it goes into 4th. Just wondering if i should try replacing the shift solenoids, if that would cause it. Any help would be appreciated. thanks
 

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2003 chevy trailblazer_ls
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I would check with a good tranny shop, they should be able to answer your question.
 

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I'm not an expert by any stretch, but I'd bet you have a bad front clutch pack in your transmission.

-- Dan Meyer
 

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Wrong. The 3-4 clutch pack has worn out sufficiently to not be able to hold the engine horsepower or the 3rd piston has cracked and it dumps fluid too fast to work.

Trans rebuild time.
 
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