Spicer halfshafts were big when oem u-joints were an exhorbitant price, making the spicers a cheaper option than new u-joints. The oem halfshafts are rated for something like 700 HP and perfectly good for almost all but racing applications, making spicers an uneccesary upgrade IMO. In fact for anyone considering upgrading I'd recommend going to more modern CV axles. Sacoperformance is selling a CV axle upgrade for $1195 probably not much more than you have to pay for the old technology spicer halfshafts.
Find the CV's here at the bottom of the page...
http://www.sacoperformance.com/products.php?cat=14
Julian
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.