tranny shift kit?

[proud73]

Hi everyone it seems every time I post its a question lol...Anyway here is another question. I have an early 99 with the e4od tranny I bought the truck used with about 318,000 mile on it. It now has 327,000. this has been bothering me for a little while now. Is there a way to tell if the tranny was upgraded with a shift kit? the tranny doesnt slip at all and under normal throttle it is quite smooth. however if I get on it hard it seems to shift hard. could this be an indication the tranny is going? or is this normal? or might it already have a shift kit? It seems as though the previous owner probably pulled a larger gooseneck horse trailer so i'm asuming the transmission has at some point been rebuilt or replaced with that kind of mileage. Any input would be appreciated. Thanks again sorry about the long post.

[szyd]

I dont think you can tell by pulling the pan. I think if you want to know bad enough you could drop the VB and speck it out to see if has been tampered with. Or just be happy it goes down the road. Most stock trannys are pretty slugesh shifters unless somthing has been done. If you are getting positive WOT shifts there probably has been somthing done. What Who knows but it is working.