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Re: Montana 2005 - hard (up)shifts
Harsh shifts in theses vans can be attributed to a worn low pressure solenoid in the tranny.
I had a harsh shift fault in a former 2000 Silouette and a filter and fluid change did the trick.
This is, however not always the case.
Normally trouble codes show up to 'steer' you in the right direction.
Personally, I'd take the van in and have a trans specialist check it out.
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