I am guessing you are trying to go with 4.10 gear ratio?
The 01 to 05 Sport Tracs are based off the 2nd Generation Explorers.
Front axle possible choices...
Any 4 door 4x4/AWD Explorer probably from 97 to 01.
Any 2 door 4x4 Explorer probably from 97 to 03.
Any 4x4 Sport Trac from 01 to 05.
Any 4x4 Ranger from 01 to Present. I'm unsure if the 98, 99, or 00 Rangers front axles are the same as the Explorers. 97 was the last year of the Twin Traction Beam(TTB) suspension on the Rangers.
*** Note - 2nd Gen Explorers started in 1995. But the front axles from 1995/1996 had a vacuum disconnect on the passenger side. And I think they eliminated that from the design in 1997.
Rear axles possible choices...
Any 4 door Explorer probably from 95 to 01. Of course if you want 4.10's I have a feeling they didn't start using them until maybe like 1998.
Any 2 door Explorer probably from 95 to 03. Ditto, on the 4door comment about 4.10's. Maybe 2doors never came with 4.10's.

Any Sport Trac from 03 to 05. Because 01 and 02 models had drum brakes.
Disclaimer: I am no expert on all Explorer/Rangers and I don't know all the different options of all the years. So some of my information could be wrong.
My 2000 Explorer Limited has a 4.10 rear axle because I swapped it in from another wrecked 99 Explorer. I don't think you will find any v8(5.0L) 2nd Gen Explorer with 4.10's from the factory. Also I'm running in 2wd mode(front driveshaft removed) since I haven't changed out the front axle with 4.10 gears yet.