do i need this? i ripped out ac and wondering if its needed. will the alternator vibrate too much?

You need to give more information.
What year?
What engine, small block, big block?

74 small block 350

You live in Houston, and you removed the air conditioning???????????
OK! :confused:

yea previous owner had started, so just went ahead and finished it up. its not going to be a daily driver anyway, my dd has ice cold ac.