I don't know what you mean my disconnecting cables? I do know this is not the std. way to drain Dexron from your transmission
Their are 2 drains plugs for your cars transmission.
One is on the pan underneath the car. A 5mm allen head wrench gets the plug out. The converter drain plug is also loosened by a 5mm allen head and getting to it is a bit more detailed. A 27MM socket is used on the end of the crank pulley to turn the engine in order to position the converter drain plug. A cross-member is removed in order to get to the converter drain plug. The cross-member is help in place by 6 bolts - 17mm - 3 on each side of the cross member.
You'll find all of this using the seach facility. Much has been said about this straight-forward task.
By the way, when the pan is off, you have access to the filter. A phillips screw-driver remoces the fasteners holding the filter.
This task is simplified by driving the front of the car up on ramps - not all of the way, but enough to allow you to slide underneath