its super easy, just take off all that plastic crap and theres a drain plug on the bottom of the trans. Loosen that then once its all out tighten it back up and theres a upper plug, looks just like the drain plug. Take that one out and put about 4 1/2 quarts of fluid in it. Your supposted to fill it till it starts coming out that upper drain that you took off (while the cars level) but on a lowered car thats kinda tricky to get to.what i had to do cuz i couldnt get under the car with it being level is to over fill it, put it on the ground level and then jack it back up once the excess had spilled out and then put the plug back in. (cabpatch)
i dont know about the fluid ou wanna use though.