my truck is a chevy blazer with a 350 auto. and is leaking tranny fluid my dad and i are going on a hunch its a busted gasket in the fluid pan

is this a possible cause if so how much would it cost to fix

also is their any other reasons it might be leaking

Could very well be the pan gasket.You can have the trans serviced around here for anywhere from $80-$120 including a new filter,pan gasket,labor and 4 quarts trans fluid.Tell the tech or manager you have a leak,want that identified,and to service the trans.It could be leaking from other areas,but the only way to tell is to raise the vehicle and visually determine where the leak is.