Check the clearance on the two internal machine screws at the bottom of the bellhousing to the gearbox. The clearance here is incredibly tight. if there is any slight brightness on the edge of the screws you have found your noise. you can get the same HS Machine head screws with a low profile head which will give you another 2.5-3.5mm clearance.
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.