Thread: GM vs ZF6HP21
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      06-28-2022, 08:06 AM   #2
CTinline-six
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Sounds like a ton of headache instead of just changing the fluid/filter.

My transmission shifted way better when changing the fluid with the Valvoline MaxLife ATF and a filter kit from FCP Euro.

FWIW, it shifts better than my friend's 2006 325i with the ZF.
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