http://home.4x4wire.com/erik/diffs/#rear
4.88's came in the Turbo V6's ....Good luck finding one..
Only the V6 was available with 4.88:1, the Turbo 4cyl were all 4.11:1. If the V6 had the "Offroad Package" featuring 33" tires (??), then then it would have the 4.88:1 diff gearing.
Nice link btw!
BigMike