Boggy Accelleration

Okay, im having a a problem with my truck that i assume is my transmission. After i changed the tranny fluid and the filter there has been a dramatic change in my accelleration, in a bad way. i also noticed that when i am driving the truck seems to be stuck in a gear, it wont shift when it is in overdrive. i have a 4L60E transmission and i was wondering if i need to get a new tranny or if it is something simple. also the tranny slips in reverse. to me it sounds like its done for. any help appreciated. Daylen

won't aamco do a free diagnostic? i don't know why it would get worse when you change the fluid and filter.... unless you did it wrong? did you add enough fluid? too much?

i checked the fluid right after we changed it and it said it was good. so i dont know why it would get worse after the change thats why i am asking about it. yah i think i will take it in to get it diagnosed.

take it back, it should have some kinda 90 day warnty on gasket and filter and the fluid

All transmission fluid level needs to be checked when the trans is hot and either in park or neutral. Being a GM it should be in park from what i remember but to be certain check on the dipstick , it will tell you

Did you use the right type of trans fluid?? NOT TYPE F