The DAF 46 was developed with Volvo's assistance, and was basically a 44 with the rear axle of a 66 and a single belt Variomatic (half the 66's transmission). A big weakness of this system is that a failed drive belt would cripple the car. The last DAF design, codenamed P900, initially intended to be the DAF 77, was developed during the transition to Volvo ownership and was ultimately launched as the Volvo 300 series in 1976, firstly as the Volvo 343 three door hatchback with the Variomatic transmission.