Yes in 2 years you overhauled 1900-2000 tanks? as for ajeya...how many of them have been upgraded? around 1000?... As for AZ being a chinese T-55 or Type-59... Over 50 major modifications make it a new tank... a brief summary of the upgrades:
The main modifications include improvements to armament, ballistic and armor protection, the fire control system, mobility and GPS. The fire control system features automatic loading, computerized image stabilization and thermal imaging for day and night combat.
• 125 mm smoothbore tank gun with an auto frettaged, chrome-plated gun barrel.
• Ability to fire APFSDS, HEAT-FS and HE-FS rounds as well as anti-tank guided missiles
• Ability to fire a Pakistani DU (depleted uranium) round,
• Automatic loader
• Dual-axis stabilization system and thermal imaging sights for the commander and gunner
• Laser range-finder for accurate range information and ballistics computer to improve accuracy
• Improved gun control system is also fitted.
• Power to weight ratio of 18.3 hp/tonne
• Maximum speed of up to 65Km/hr
• Modified torsion bar suspension system to improve crew comfort.
• Modular composite armour and explosive reactive armour
• Pakistani ATCOP LTS-1 laser threat warning system. The ATCOP LTS-1 warns the crew when the tank is the target of a laser designator or a laser rangefinder.
• Smoke grenade launchers
• Automatic fire-extinguishing and explosion suppression system to improve crew survivability.
• New turret
• New engine
• Ability to fire ATMs
etc etc...
T-59:
AZ:
Without ERA:
Panters,AR1A-100s are being produced under ToT... While an indigenous SPG is under development ... look up the 2019 arty modernisation plan of PA..