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You have an 8.8" axle with 3.55 gears on an open carrier. As long as you get an 8.8" axle from an F-150 or Bronco you'll be alright. Before 1983, all Broncos and F-150's came with a 9" axle, which looks different and isn't available in the same ratios. Close, but probably not what you want. After 86, they all had the 8.8".
Top Number is S838B S=Sterling Plant, 838B=Plant Code
Bottom Number, 355= 3.55 Ratio, 88=8.8" ring gear diameter
3802 3=year, 8=month, 02= day of manufacture.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.