2001 Pontiac Transmission 1st gear issues

Dystonic

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Hello,

We have a 2001 Montana with about 105,000 miles. It’s been great so far. We’ve started having transmissions issues. A few weeks ago it was whining at speed in third and fourth gears. Now it’s really hard to get speed at a dead stop in first gear. Not sure if it’s in 2nd/3rd gear or just slipping, feels more like it’s still in a higher gear. No check engine light. It has never hard shifted switching gears at all.
Any way I can troubleshoot?
 
You can try a fluid and filter change with some Lucas additive but it sounds like it needs a rebuild.
 
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