Hope this helps some folks with the 4T65E
First I collected all the materials.
Transgo 4T65E shift kit
9 quarts of Valvoline Dexron VI
1 Genuine GM transmission filter
2 cans of brake clean.
The other stuff is for a cooler I installed on the same car.
3 inch extension
6 inch extension
10 mm socket
2 jack stands
Jack up the car.
Place on jack stands.
Get a bucket or drain pan that will hold at least 8 eight quarts.
(The 4T65E holds about 12, this procedure will drain about 8)
Remove the 20 10mm fasteners that hold the pan on.
Go slow, undo the back and leave the fronts in a bit, this allows the fluid to drain out of the back side.
Once the drain slows to a trickle completely remove the 20 10mm fasteners.
Carefully remove the pan as there will be about 1 to 2 quarts left in the bottom.
Clean the pan, the gasket is reusable. Clean that up and set it aside.
Remove the filter. It presses into a collar that seals it, wiggle it a bit and pull straight down to get it out.
Now on to the shift kit install.
Remove the accumulator. These are 8mm fasteners. Only the four circled in the photo below will need to be removed. The rest will be removed later to access the pistons.NOTE: loosen the remaining fasteners but donít remove them. It makes it easier to remove them while on the bench.
There are three tubes going into the accumulator they are just pushed in, they wiggle a little. just pull the accumulator down and carefully remove them . Two of them will hang down the third one will stay in place.
Finish disassembly of the accumulator on the bench. Use the scotch brite to slightly rough up the bores of the accumulator.
Follow the Transgo instructions for install in the kit.
You will use all the spacers, and when you are done you should have a yellow and red spring left.
This is the order the springs will be installed onto the pistons in the accumulator.
Make sure to lube the o-rings on the pistons with system fluid before reassembly.
I bought a new accumulator gasket because I have the OCD, but they can be reused.
Reassemble the accumulator.
Reinstall the accumulator in the transmission, be sure to get the tubes in the correct spot. The two complete metals ones are next to each other the one with the rubber joint is on the end.
Install the new filter. Push straight up and wiggle a bit. If it doesn't stay in on it's own replace the collar with the new one supplied. TAKE YOUR TIME, getting the old one out sucks. You have to use an appropriate sized socket and small hammer to put the new one in. Put the socket on the lip of the collar and use the hammer to get it flush with he body of the transmission.
Reinstall pan, fill and enjoy.
Makes a huge difference on the how the car shifts. Worth the 39 bucks it cost me to get the kit.