In Tech Service Bulletin 10, Article 85, Ford says Pantera rear tires should be matched in circumference as a pair to within 5mm (0.2") in order to equalize LSD clutch wear in your ZF. They're speaking specifically of Goodyear and their careful sizing of the rear Arrivas back in 1974, but I expect it applies equally to any rear tires on any Pantera- even the now-popular 17-20" rears. Shops used to sell a stagger-tape for pavement or dirt track racers to do this. Tire molding may be more preciser now, but anyone ever checked this on your $$$$ giant rears?
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.