"Trans scanner found no codes"! Think im gona try a fluid change

Yes that sounds good, I would still add the Seafoam Trans tune for 500 miles before the fluid & filter change though.
That may remove some varnish and make things better!

I would not hurt to add the Seafoam after the change as well. I did, and change my fluid every 40k.
It would not hurt to have a look inside the accumulator bores while pan is off. Make sure all is well in there.
When U installed the TransGo shift kit did u scuff up the bores as well?
I used 1000 grit emery cloth wet with trans fluid in a circular motion inside the bores before installation.

Ok, im gonna try that.. And yes, i used 1000grit sand paper & a little tranny fluid.. Also did it in a circular motion as well...

Is that Sea Foam Trans Tune available at Autozone, Pep Boys, etc? I have a 04 LeSabre with 118k miles and I get the same thing once in a while. I need to check the trans fluid level - haven't done that in a long while.
Thanks.
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2004 LeSabre Limited 3800

Yea its availiable at autozone thats where i picked it up from. Ik Oreillys also carry it.

"Quick update" i think i have a problem & i belive the trans fluid is getting to hot & possibly boiling or close to it.
Reason being! "I drained some of the fluid before adding the "trans tune" just about half of a glass just so that i could get a good look at the fluid condition. Now i changed my tranny fluid not to long ago. And i believe it shouldnt be "dark" this soon.. This could be my problem in its self... Any input anyone?

How did u drain a half a glass out?
When u say dark are u talking more reddish or black looking? Did it smell burnt?
Keep in mind that when u drop the pan you are only removing half of the rebuild capacity of fluid. 6 quart pan drop to 13 rebuild, lots stays in converter etc.
So if it was a long time in initially and u changed it recently u still only have half new fluid.
Average running temp of trans-axle fluid is 180-200F
Normally if fluid is burnt it will have foul burnt smell to it.

I loosend enough bolts on the pan to allow it to slowly drain... And id say black with a hint of red

This is my tranny fluid in a clear container, i took pics at different angles, and use a direct light from my high beams. Thats the only time u can actually really see the redness in it... Mind you it hasnt even really been a 2 months since i changed it. And also i dont drive much.