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To flush the transmission, you will need a machine that heats the fluid since the 6R140 has a thermostat. The thermostat prevents fluid from going to the radiator/cooler when not needed. You will need the fluid heated to open the thermostat.
It is easier to use a radiator vacuum fill device when filling the cooling system after a flush. You use air connected to the tool to pull a vacuum on the cooling system. Once you have a vacuum, you can disconnect the air source, get a bucket that will hold your 50/50 coolant. Drop the pickup tube form the vac fill device into bucket and opening the valve. Once the bucket of 50/50 gets low, close the valve and add more coolant to bucket and repeat. This is the method Ford recommends.
Yes, you can do the burp/fill process also.
You do not need to flush unless there was oil or other contaminants in the coolant. It is recommended to use purified water when mixing full strength coolant to achieve 50/50. Your owner's manual will tell you approx mixed coolant quantity needed to refill the system.
You can use any coolant, DexCool or similar that meets Fords requirements or the ASTM specs at this link
2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.
Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015
Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles