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hey guys so today it was a little warmer outside and the trans was about 150 degrees so i checked it again, it was low it was reading at the Cold mark. i added about 3/4 a quart and brought it up to the top of the HOT hash marks. truck seems to shift better now it must of been low this whole...

thanks for all the replys guys, to answer some of your questions i bought the truck with 190k it now has 240k and ive never changed the fluid. when summer finally rolls around ill check the fluid again. its starting to get warmer.

hey guys new member here. so i own a 2004 gmc sierra 2500hd with the 6.0 and 4L80e. the trucks runs great but i noticed recently when i cold start it and drive it without warming it up it feels like its sluggish like the trans is slipping but not? its hard to explain. the thing is once its...