I know the 1999 had the 4R100 and my 1997 F350 had an E4OD. The 1998 year was a transition year and I am not sure which it had. I believe the V-8 vans had the E4OD and the V-10 got the 4R100. You can take the VIN and call Ford and have them check. 1999 was the first year of the Super Duty in the F350.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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