Kammala jumla mai zuwa: Kusan nan da nan an maye gurbin ƙirar T43 da sigar Mark III na "Formula Two" chassis. Maddock da Coopers sun haɓaka ƙirar da ke akwai ta hanyar sauya dakatarwa na gaba don ingantaccen tsari na dakatarwa na biyu tare da masu shawo kan damuwa, a maimakon tsofaffin motocin ƙirar tsararren tsararren tsararru. Sabbin matakai na matakai a cikin transaxle sun ba Maddock damar saukar da injin (yanzu ya haɗa da "FPF" na Climax a cikin motar Formula One), yana rage tsakiyar nauyi na sabon Cooper T45 (Mark III) ta hanyar shigar da injin bushe-sump da yawa. Maddock ya ba da wannan ƙwarewar musamman ga Jack Brabham, wanda ya karɓi shawarar daga abokinsa na Ostiraliya, Ron Tauranac. Brabham da Cooper sun ba da gudummawar wasu cikakkun bayanai, amma Maddock ya bar tsarin tsarin gyaran gyare-gyare ba tare da canzawa daga T43 ba. T45 ya yi nasara nan da nan. A hannun Maurice Trintignant, sabon T45 na Rob Walker ya lashe gasar cin kofin duniya ta gaba,
Babban kyautar Monaco ta 1958.