is shifting bad on a 4l60e?

i have a 4l60e with a transgo shift kit and ive heard that its bad to downshift and ive heard that it doesnt hurt a thing to downshift. i just want to know for sure before i do it when i get my tranny back after the second rebuild. also i want to know if upshifting hurts anything

depends on when you downshift and the rpm. it should not hurt a thing when done using common sense

Like byrons said, depends on how you are downshifting. If done right it does not hurt a thing. They made that option available for a reason.

i dont mean snatch it in second running 80 mph. lol that would be crazy..im talkin like downshifting to first manually when im driving over 35 miles an hour when it wont downshift by stomping the gas

I manually shifted mine all the time, TransGo shift kit with a TCI 2800 stall.
The first tranny had just the shift kit in it, and it lasted till about 130k.....not too bad really. The second was a supposed "performance build" done locally and thats when I put the TCI stall in it. It lasted about 24k before losing 3 and 4. I got really frustrated and found a good deal on the TH400 now in my car and I.ll never go back.
In my opinion you don't want to manually shift the 60E, if you wanna beat on your tranny then get a manual valve body TH350/400 or find a good tranny builder (there are a couple on the board) and cross your fingers.

im talkin like downshifting to first manually when im driving over 35 miles an hour when it wont downshift by stomping the gas
That might be a little harsh. The engine will shift at 50-55mph (with 2.73), so it would be in the RPM really high. Downshifting to second would be fine though.

downshifting to second while running less than 50 i have no power at all until i hit about 45-50...i will be getting a 3.73 soon though and hopefully that will make a huge difference.

any good recommendations on stall converters?