The time and mileage will come where it becomes necessary to change the oil in your Vette's automatic transmission.  I changed the fluid and filter in a 2005 C6 with automatic transmission 4L65E.  If you are planning on taking on this task, you will need 5 liters of oil.
0001
The kit above supplies the parts need to do the chore.
They are not AC Delco parts, but will work just fine.
0002
0003
Jack up vehicle and secure properly, this is not an easy job if you don’t have a hoist, but still do-able.
On some models you may need to remove the Y pipe. (Below)
0016
You may need to lift the transmission and differential also, just a bit to make room for the drain pan to come out. (Below)
0004
 The four nuts that need to be loosened off or removed to lift the differential and transmission are shown below. 0010
0011
Backing off the four nuts. (Below)
0009
The picture below shows supporting the rear end. I have a small block of wood on the bottom of the transmission pan. This was a mistake. It should be supported on the differential, that way you can get the pan out more easily.
0012 OK, with the Y-pipe out of the way, the four mount nuts off, now remove the drain plug from the pan. Be ready to catch the 3 - 4 liters of oil. Drain plug shown below.
0005
 This bolt is the hard one to get out. I loosened it with a wrench first. It’s on the back passenger side of the pan. (Below)
0008
0013
 Now remove the 15 bolts from the pan. I loosened all the bolts first and removed them, leaving 2 in the pan loose to hold it in place. (Below)
0006
0007
 Now support the pan. (Below)
0012
Remove the remaining bolts, and slowly pull the pan off. (Below)
0015
0014
Be careful! You may end up with a need for a little stain remover next wash.
0017
Pan is removed.
0018
 To prevent wear and tear on the transmission, some cars will have a magnet in the pan to pick up small filings and metal particles.
0019
Remove the magnet from the pan and wipe it with a rag.
0020
Now clean the pan inside and out. “Cleanliness is crucial here.” Remove the old gasket completely. (Below)
0023
View of the transmission with filter still in place. (Below)
0021
Below, the filter is off and you are looking at the valve body.
0022
 I used a very small amount of gasket maker just to hold the gasket in place; makes it easier to install. (Below)
0023A
Installing the gasket - make sure the pan is spotless. (Below)
0024
 Now while the gasket is drying, install the filter. It only goes one way.
0025
0026
Make sure to remove the old seal that held the filter in. It goes on the “neck” 
0027
 Re-installing the pan, (below), and put in 2-3 bolts just to hold it up there then install the remaining bolts. I tightened the bolts up snug, then torqued them in place.
0028
 Torque on the pan bolts is 11NM or 97 Inch lbs. Once the pan is secured, you are ready to add fluid.
0029
Now fill the pan up through the drain hole until fluid runs out.  Re-install the drain plug and torque to 22 foot pounds. Start the engine and let it warm up to at least 90 degrees C. Keep the engine runnning.  When that temperature is reached, remove the drain plug and see if any fluid comes out.  If there is none - top up until it is full.  Reinstall the drain plug and move the gear selector slowly through the gears.  Check the fluid level again to see if any fluid comes out.  If not - repeat the procedure.  Do not remove the drain plug without the engine running.
 0030
This pump was used to pump fluid in. (Above)  When you reach a point where fluid is seeping out when the drain plug is removed - you are there.  The fluid level is high enough in the transmission.
 0031
After the pan is full, torque the drain plug to 22 foot lbs. Re-tighten the four bolts securing the differential and transmission in place.
You're done!
 
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