Ford F-Series (fourth generation)

[3] In line with the car-based Ford Ranchero, the Styleside configuration welded the cab and bed body stampings together (removing the gap between the two).

Alongside the debut of the four-door crew cab configuration, the long-running "Twin I-Beam" independent front suspension and 300 cubic-inch inline-6 were both introduced.

[3] The design required fewer stampings, such as the back of the cab served as the leading edge of the bed, less complicated assembly, such as the single-wall bed sides were spot-welded directly to the door sills, and the body had a less complicated path through the assembly plant's paint shop.

[3] This achieved cost savings in the manufacture of the truck, but the one-piece cab and bed body was still mounted to a traditional ladder frame chassis.

Due to poor market reception, and rumors that overloading caused the doors to jam shut, the unibody trucks were dropped midway through the 1963 model year.

Replacing the rudimentary straight-axle in the front was all-new independent "Twin I-Beam" suspension with coil springs on two-wheel-drive trucks.

First vehicles were made in the old plant of La Boca, in the Ciudad Autónoma de Buenos Aires.

New automotive assembly regulations and laws favoring domestic manufacture over imports were decreed by the Mexican government in 1962.

1961 "unibody" design