What year ranger rear end is the same as my 2001
Find a wrecking yard or go online and look up "Hollander Interchange Manual", it will have all the information you need. from my experience I think you will find 1998-2004 will all be the same width and leaf spring locations, but the brake drums width might be different for 2wd vs 4x4.
Search Ford Ranger Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Ranger Experts