3.08, 3.31, 3.55, 3.73. I think 4.10's were available in the 7700's, but those had 10.25" axles. The vast majority of all 97-03 trucks came with 3.55's. Mine did, and so did my son in law's 98 Lariat Scab 4x4 with 4.6 auto. That means you can find 3.55's in almost any junkyard, and there's a good chance you can find one with LS too.