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A couple of things could be wrong, Dave but in my case the Sonnax TCC valve kit seems to be working.
If I had the bucks readily available, I probably would go ahead & replace the valve body, [I don't know if the Sonnax TCC kit takes care of all the potential valve body related issues or not], but for $275 installed & no more slamming 1-2 shifts, I'm happy so far with Sonnax.
Good luck with yours!
-Mike
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For reference:
2006 TrailBlazer LS
I6 2wd
Automatic trans
~72 k miles
I miss my '97 Blazer...
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