shifting before desired shift times?

[chevypower101]

why is my 2-3 and 3-4 gear shifting early like ill see .200 shift time with a .300 shift error where I haven't even altered tm pressures anything really I can reset to stock tune and still get it Ive seen .000 actual shift times at 2-3 shift with a .6 error...3-4 always shifts early maybe its time for new trans one with a lever that I shift it myself

[odom1957]

post the tune please. i am also not sure what you are trying to ask. it seems like you have a tranny shifting too fast, regardless of what you input for the shift time. i had this same issue with a 6l90 in a 3/4 ton gasser a year or so ago. i need to look up my tune files to see about what i did to fix it.