Shift solenoids or 3/4 clutch - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Transmission Mods

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Old 05-11-2019, 03:24 AM
Smudger Smudger is offline
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Join Date: May 2019
Posts: 1
Shift solenoids or 3/4 clutch

I have been using this forum for a while with great success so thanks to all but now I have a question.
My 2005 Trailblazer ext with 158k miles has a transmission problem. Reverse is good and it takes off as usual through 1st and 2nd then when it should go into 3rd it just revs, if I let it get to around 4K and back off the throttle it goes into 3rd but never into 4th. Would it be the shift solenoids (which I could probably change myself) or bad 3/4 clutch (which I would take into a shop to be rebuilt). If it needs to be rebuilt how long can I continue to drive it while I get the money together to get it rebuilt (I am currently only using it around town where I don’t need to go into 4th - I have probably done 300 miles like this already and what will be the next sign(if any) that total transmission breakdown is imminent?
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Old 05-21-2019, 04:48 PM
kcducttaper kcducttaper is offline
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2008 Chevy TrailBlazer LT
4.2L I6 4X4
Join Date: Sep 2018
Posts: 30
I'd check the fluid level and pull the tranny codes first. A lot of auto parts places will scan it for free. That should at least get you pointed in the right direction.
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