I did a filter change/drain & fill on my 2007 Uplander last week. 65k miles and the fluid was still in very good condition. I was surprised at how little debris there was in the pan and around the magnet.
I used a NAPA replacement filter and 7 liters of Petro-Canada Dex VI to complete the job.

It was quite straight forward. The old filter releases with just a little pulling and rotating straight down ... and the new filter presses right back into the o-ring.

Re-use the original pan gasket ... just be careful not to tear it. Gently re-torque the bolts ( ~10 f/lbs) and you'll be good-to-go.

I believe it is better to change the transmission oil a little in advance of recommended interval ... to catch the oil before it gets depleted/worn out.

All the best.
Bob

 

Bob,
Thanks for the info. I have a 2008 Uplander with 103,000 miles on it. I had the transmission flushed at around 55K miles. I am planning on changing the filter soon. I have a Wix filter but only got 4 quarts of Dex VI. looks like I will need to pick up 3 more quarts before I start.
Thanks again Dave M

 

Its best to be a bit under-filled then over-filled on the initial fill...
Its easier to top off as needed than to try and take out from an over fill... and an over fill can do more harm if left un-addressed...

Gauge what you get out of the pan and put that back in and go from there....
When you do your test drive after the work is done, take a quart or 2 along with you should it slip from being too low and you can add on the fly...

 

Ended up using 7 1/2 quarts

 

7 Liters = ~7 1/2 US quarts