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We thought about swapping the Brian's Truck Shop 4R100 into our 46-inch-tire-equipped Super Duty ourselves in the driveway, but Pw's got this "No dying till the magazine's written" rule that we can't break. Luckily for us, Frank Gilliland, owner of South Bay Truck & 4x4, is less than 20 minutes away and is well equipped for any type of 4x4 repair--including transmission swaps. To make the exchange as easy as possible, Gilliland removed the transfer case first and then lowered the transmission with a jack. While the transmission was out he flushed the cooler lines with carb cleaner and a compressed air chaser to remove any contaminants.