1995 gmc sierra V6 2WD

When I was driving forward today i was having a VERY loud grinding popping from under the truck near the fron end, Like something steel was getting ready to snap. I was having some squeking issues recently but it would come and go. The only thing i noticed was my transmission fluid was real low which is really strange because i checked it a couple months ago. added some fluid drove it around the block a few times and everything was quiet but as i said it just comes and goes but when it comes it sounds pretty violent i just let off the gas.

I know i probably didnt give as good explanation but does anyone have any ideas? nothing appears out of place, BTW im having the shocks replaced this weekend.