I'd recommend a drain/fill with Dexron 6 atf ea. 30k mi. Easy diy project: With eng. cold, loosen/remove atf dipstick to vent. Place a 6qt.+ drain pan under the 11mm drain plug and remove. Replace plug and add 5-6qts. of new Dexron 6 atf. Done. I don't even jack/lift the car. I use a 3/8"dr. ratchet with 11mm socket to loosen the plug and a 1/4"dr. ratchet/socket to tighten. Easier than an oil change. No filter involved.

 

Read your vehicle owner’s manual - GM does not recommend a transmission flush.

Some dealers and others use a chemical cleaner with the “flush” which GM considers a contaminant.

The transmission filter is only serviceable on your model if the transmission is removed from the vehicle and opened. As such, a drain and refill with Dexron Six transmission fluid is the way to go.

 

Super easy to do yourself. 20 us dollars for fluid on Amazon.

Just do it three times at 250 mile intervals and you will still come out ahead 60-90 $ of fluid depending on current price.

 

Price 5 minutes ago

 

If "flush" means a (more) complete fluid change, I would recommend it.

 

The problem with some transmission “flushes” is that the service center or dealer uses an aftermarket flush machine, with aftermarket fluid and a chemical cleaner - which GM does not recommend.

 

^+1. You could accomplish that by using the tranny's cooling lines, a 5 gal. bucket and the tranny pump, but you run the risk of running the pump/tranny dry. I'd stick with the drain and refill, easier and cheaper, lol.

 

I took my Impala into GM and had the transmission flushed which also comes with a warranty if the transmission is not modified. Thats a bit unfortunate because I was looking into using a tech 2 scanner to hopefully disable the adaptshift feature these transmissions have, this is where the car will downshift automatically going down a hill if you accelerate about 10kmph without touching the accelerator. i am not the biggest fan of this coming from an Aurora with the 4t65e that did not downshift on its own.