 The BT19 was initially fitted with a Hewland HD ( Heavy Duty ) gearbox , originally designed for use with less powerful 2 @-@ litre engines . The greater power of the 3 @-@ litre Repco engine was more than the gearbox could reliably transmit when accelerating at full power from rest , with the result that Brabham normally made very gentle starts to avoid gearbox breakages . The HD was later replaced with the sturdier DG ( Different Gearbox ) design , produced at the request of both Brabham and Dan Gurney 's Anglo American Racers team . It later became a popular choice for other constructors . 
