ultrastang
Founding Member
The first generation Broncos, 1966-1977 all came with 28-spline axles. Some of them didn't even have Limited-Slip/Traction-Lok differentials in them.
Most '65-'72 model Ford half ton pickups came with 28-spline axles/differentials. Most didn't have Limited-Slip/Traction-Lok differentials, but some did. The '73-'85 Ford pickups primarily had 31-spline axles, and again, most had open differentials, but there were some Traction-Loks installed.
Limited-Slip differentials were available up until 1968 (in both cars and trucks). After this, Ford revised the differential to an improved version and it was called "Traction-Lok". --However, 1969 is the worst Traction-Lok differential to have because of 4 large holes cast into the left (driver's side) half of the differential. These differentials are notorious for breaking in this area. The best Traction-Loks were produced from 1970-1985.
http://ultrastang.com/Rearinfo.asp?Page_ID=5
Most '65-'72 model Ford half ton pickups came with 28-spline axles/differentials. Most didn't have Limited-Slip/Traction-Lok differentials, but some did. The '73-'85 Ford pickups primarily had 31-spline axles, and again, most had open differentials, but there were some Traction-Loks installed.
Limited-Slip differentials were available up until 1968 (in both cars and trucks). After this, Ford revised the differential to an improved version and it was called "Traction-Lok". --However, 1969 is the worst Traction-Lok differential to have because of 4 large holes cast into the left (driver's side) half of the differential. These differentials are notorious for breaking in this area. The best Traction-Loks were produced from 1970-1985.
http://ultrastang.com/Rearinfo.asp?Page_ID=5