Collin

pop the cover off the diffs and the ratio will be stamped on the ring gear

akdoggie

You can also turn an axle and do a count. If it turns just over 3 turns of the d/shaft v/s 1 revolution of a brake drum it would be 3.08. If it does 3 1/2 turns it would be 3:55's, ect. That is a simple field check, but subject to close calls when trying to be exact, but should work for what you are trying to find out.

19 is a non-locking 3:55 for Ford F150's, 8.8. Non-locking carriers have a number number code, where the locking axle has a letter number or letter number number code. The letter (no matter what letter) designates locking differential, and a number number are the non-lockers. Hope that helps you.

gustrider4

I have a 99 expedition and 02 f150. My 99 expedition has a 19 code(open) and my 02 f150 has a h9 code (limit slip). The expedition has 12mm bolts and the f150 has 14mm

akdoggie

99 was the last year for the 12mm studs on any F150 or Expedition axle. In 2000, they all went to 14 mm studs/nuts. Everything interchanges except the actual axle itself. You wouldn't want 1 14mm axle and 1 12mm shaft. Everything else fits. The wheels will interchange between all 97-02 Expeditions and 97-04H F150's. The 14mm wheels will go on the 12 mm studs. Many guys are running FX4 wheels, and they are set for the 14 mm studs. You can align the wheels with 2 conical nuts, then tighten the flat faced nuts (3 remaining) and then replace the conicals with regular nuts. The wheels will sit fine and not move, one they are tightened.