[muddog321]

4wd has 2 sets of lines and all leak at the metal crimps. Front set is easy after you remove the air filter box, slide the plastic retainers back and take the snap or C clips retainers off the lines pull out of the radiator. The set filter to engine has clearance problems and is a pain. Have to lift the engine about 1" to get past and possible engine mount separation if you don't pull that long bolt out (many just jack the oil pan up but it does rip the rubber). The lines are held on by 1 bolt reached by about 2 1/2 feet of extension from up front along the lines to the bolt (really fun to insert).
If you don't do this stuff well take it to a shop as you will not miss this adventure at all!

As for the flushing Dex every 3/50 is smart and always keep the reservior full to Hot when Cold so no air gets in and a new cap and thermostat each time also. Many options on the flushing as you have seen and I do the heater core separately with 3' sections of 5/8 and 3/4 hose so no extra carp gets in there and then you can use the disconnected heater hose to flush the block also - and the rad drain is lower pass side bottom. Many posts on flushing methods.