Colotti Trasmissioni

One of the first achievements was the design and manufacture of differential gear set/housing for Rob Walker, which solidified his reputation in the Grand Prix circles.

At about the same time, Alf Francis, the Chief Engineer at Rob Walker Racing, started working with Colotti, changing the Tec-Mec name to Colotti-Francis.

Francis and Colotti knew the shortage of limited slip differential manufacturers was a big hardship experienced by Grand Prix constructors then.

But despite these transaxles being unique and innovative, they still incorporated limited slip differentials made by ZF of Germany, which was about the only source, and the technology used was an old slip-limiting principle invented by Ferdinand Porsche in the 1930s for Auto Union GP cars.

[1] The car went on to score the second and seventh-place finishes at the 1963 Indy 500 in the hands of Jim Clark and Dan Gurney, respectively.

[2] Colotti Trasmissioni was also active in the Rally sector, by developing a new kind of limited-slip center differential for four-wheel drive competition cars.