You would have to swap in a 4.44 rear diff (could even get a jdm R180!). Then you'll have to pull the trans, pull the front diff casing, swap the 4.44 R&P from an earlier model. You'll likely also have to shim it etc.
If you've never regeared a diff or opened up a trans, I'd probably have a shop do it.
If you've never regeared a diff or opened up a trans, I'd probably have a shop do it.