Sachs da direban motar motsa jiki Dave MacDonald, rookie 500, an kashe su a cikin hadarin da ya shafi motoci bakwai a zagaye na biyu na
1964 Indianapolis 500. MacDonald yana tuka motar da Mickey Thompson ya mallaka kuma ya tsara, "Sears-Allstate na Musamman" # 83. Thompson ya nemi jami'an USAC su ziyarci shagonsa a California don duba motar yayin da ake ginin don kada ya saka kuɗi a cikin motar idan akwai damar da za a soke shi a Speedway. USAC ta amince da bukatar kuma ta wuce motar tare da kunshin tasirin ƙasa. A lokacin da motar ta isa Speedway a watan Mayu, USAC ta canza tunaninsu kuma ta kasa shi. Yin aiki a cikin sararin samaniya na filin ajiye motoci, Thompson da ma'aikatansa sun sake gina motar don saduwa da sabon ƙayyadaddun USAC. Waɗannan canje-canje, cire fenders, canzawa zuwa manyan tayoyi da ƙara tsawo daga inci biyu zuwa huɗu, ya sa motocin ba su da ƙarfi. Graham Hill ya gwada motar kafin Indy amma ya ki ya fitar da shi a 1963. Masten Gregory ya yi hadari a farkon wannan watan saboda hauhawar iska. Bayan da MacDonald ya cancanci kuma kafin tseren, Gwarzon Gwarzon Gwarzon Formula One Jim Clark, wanda ya san MacDonald kuma ya girmama ikonsa, ya bi Californian na da yawa. Bayan sun shiga, Clark ya gaya wa MacDonald ya fita daga motar. "Ka fita", in ji Clark. "Ka fita kawai ka yi tafiyarka". Amma MacDonald ya ji ya wajaba ya cika kwantiraginsa da Thompson. Sauran direbobi sun bi shawarar Gregory kuma suka guji motocin Thompson. Kafin tseren, Gregory ya kusanci direban Formula One Jack Brabham, wanda ke tare da MacDonald a kan grid, kuma ya bukaci Brabham ya ba sabon shiga sarari da yawa. Brabham ya yaba wa shawarar Gregory da ceton ransa.