621F ndi 721F zili ndi njira zinayi zamagetsi zomwe zimalola ogwiritsa ntchito kufananiza mphamvu ya makina ndi mphamvu ya injini yomwe ilipo. Zonyamulazi zikuphatikizapo ma axle olemera okhala ndi ma auto-locking kutsogolo ndi ma differentials otseguka kumbuyo kuti azigwira bwino ntchito m'mikhalidwe yosiyanasiyana. Axleyi idapangidwa kuti ithandize kuchepetsa kuwonongeka kwa matayala, makamaka pamalo olimba, malinga ndi OEM. 621F ndi 721F imapereka Efficiency Package yosankha yomwe imaphatikizapo transmission ya liwiro lachisanu yokhala ndi lock-up torque converter kuti ifulumire kuyenda pamsewu, kuthamanga ndi nthawi yochepa yozungulira, komanso ma axle okhala ndi auto locking differential ndi pulogalamu yapamwamba yamakina. Transmission ya liwiro lachisanu yosankha imaphatikizapo Case Powerinch yomwe imalola ogwiritsa ntchito kufika pa zolinga mwachangu komanso molondola mosasamala kanthu za liwiro la injini. Case akuti izi zimatsimikizira kuti palibe kugwedezeka ngakhale pamalo otsetsereka, zomwe zimapangitsa kuti zikhale zosavuta komanso mwachangu kutaya mgalimoto.