My mazda626 2001model runs on gear 1 only. I change tђξ engine and gear box because ѼƑ previous gearbox problems and engine not running smoothly along side fuel consumption. After changing tђξ engine, tђξ car took M̶̲̥̅e from lagos to asaba without issues. Shortly after my arrival in Asaba, my brother drove tђξ car and told M̶̲̥̅e tђξ gear is not changing. Tђξ transmition oil is OK. Please, what could be tђξ possible cause??