I would ballpark it around $1100 to $1500 that is labor, seals, gaskets, ring gear bolts,thrust washer,shims and complete tear down inspection, unless you are into a ring and pinion or some type of other major work.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.