Yes, it was. But when it's equipped with:
The Phoenix Project addresses both immediate and emerging operational threats to the M60 Main Battle Tank using a modular and flexible approach to improve shoot-on-the-move capabilities, as well as increased lethality, mobility, and survivability. These upgrades are achieved at low technical and operational risk and at low cost.
Pre-upgrade Status
Old fire control system (TTS), slow in engaging targets
105 mm Main gun
Unable to acquire and fire on targets while moving
Thermal sighting system is not stabilised.
Armour protection level is not suitable to the foreseeable threat
Engine Power and suspension system overdue for upgrade
Post Upgrade Status
Ability to acquire both moving and stationary targets
High rate of first round hit probability
Improved protection and survivability
Improved mobility and manoeuverability
Upgrade Specifications
Phoenix Shoot-On-the-Move Upgrade
True shoot-on-the-move capability, day/night target acquisition, and improved first round hit probability are achieved
with Raytheon's Integrated Fire Control System (IFCS) upgrade.
Phoenix Lethality Upgrade
Significant improvement in the firepower and lethality of the current M60 platform is achieved through the replacement
of the M60 105 mm rifled cannon with RUAG Land Systems L50 120 mm smooth-bore Compact Tank Gun (CTG).
Phoenix Mobility Upgrade
Improvements in M60 acceleration and cross-country capability are achieved with the mobility upgrade provided by
General Dynamics Land Systems.
Phoenix Survivability Upgrade
Survivability is improved through the addition of the armour protection scheme for both the M60's turret and the hull.
The protection scheme can be reconfigured to changing threat conditions.
Surveillance and fire control
Eye-safe laser rangefinder integrated into gunner's sight system:
One pulse / second rate
200 - 9,995 m range
One million shot life
Second generation night sight integrated into gunner's sight system:
Linear cooler
240X4 detectors
Two-axis, stabilised line of sight platform with a director system.
Gun elevation sensor:
With electrical resolver
Replaces mechanical ballistic drive
Dynamic Vehicle Cant Sensor
Modular Ribbonised Organised Integrated (ROI) wiring system
Digital ballistic computer system
Turret stabilisation system upgrade
MIL-STD 1,553 digital data bus
Laser Warning Device
Hemispherical Coverage down to -30°
Continuous Coverage from 500 -1,800 nm
Probability of detection:
95 % Single pulse;
99 % Multiple pulse threats.
Threat Coverage includes latest generation, beam rider and high energy dazzle lasers
Optical threat reloading and identification
Gun Parameters
Semi-automatic dropping wedge breech
Mean Recoil Travel: 440 mm
Maximum Recoil Travel: 450 mm
Mean Recoil Force: 290 kn
Maximum Recoil Force: 390 kN
Design Gas Pressure: 7,400 bar
Elevating mass: 3,780 kg
Recoiling mass: 1,860 kg
Rate of Fire 6 to 10 rounds per minute
Survivability
In Development: add-on armour protection pack, ammunition storage and containment system
Man-ready Ammunition Containment unit
20 rounds ready-rack storage
Electro-mechanical Gun/Turret drive unit (In development)
Digital motor drive unit
EM Traverse mechanism assembly
Fully developed turret control and stabilisation software
Mobility
Upgrade engine to 950 HP(General Dynamics Engine upgrade)
Upgrade transmission to CD 1,000
New air cleaner and air induction systems
Improved suspension system
New and improved final drives
High speed directed launcher (HSDL)
Number of tubes: 2 to 12
Coverage: hemisherical
Payload type: multi-spectral smoke optional hardxill
It was upgraded to meet "NATO standards", it has nothing to share with M-60 A3 but only the chassis. Let me ask you whether you would consider this upgraded M-60 a 2nd gen tank or not:
The same thing goes for M-60 Phoenix.