Don't know if it's serious or not

[iknowyoulike]

Well as i searched around it seems like alot of people been having there trannys go out on them is the tranny on our cars just weak or something?

Well here's the problem (i searched but still couldn't find the right answer)
Somes times when i'm at a complete stop and put my car back in 1st gear it makes a quick grind then i have to quickly pull back to neutral and put it back then it's fine. This only happen sometimes also today i was powershifting to third on the highway and heard a quick little grind is that bad? what can i do is it the Tranny going bad? Could it be my fluid? My car has about 145k on it and i just got it, so i haven't check the level of the tranny fluid yet. Also what would happen to the open Differential if it had no fluid in it? <----just wondering on this one..but im really worried about the tranny thing it happens alot in first gear only. any suggestion at all