Although there were many variants on the turret, the basic chassis was almost unchanged until 1985, when changes including a new diesel engine, fully automatic transmission and new hydropneumatic suspension were introduced.
Meskipun banyak varian pada turret, sasis dasar Tank ini hampir tidak berubah sampai tahun 1985, ketika diperkenalkan perubahan termasuk mesin diesel yang baru, transmisi otomatis penuh dan suspensi hydropneumatic baru.