It like all the Shermans saw a steady flow of minor improvements, and versions of this tank with HVSS started showing up in December of 1944 and would be come increasingly common from that point on as replacement tanks. These tanks were very well received, the Ford GAA was a very good motor for a tank in the Shermans weight range. The low RPM torque the motor matched the existing gear ratios in the transmission, and the motor was way overbuilt for the stress it was under. Once the HVSS suspension started showing up, this really became the ultimate Sherman.
Some like to point out the Various firefly variants were better, but I think that’s wrong on several counts. First, the Ic and Vc firefly tanks were based on the M4 and M4A4 tanks, meaning they came with the old small hatch hulls in most cases, though the Ic composite tanks used a large hatch hull, they were still saddled with the two least desirable engines. The you have to look at the gun installation, the T23 turret on the 76mm tanks was designed with the M1A1/A2 guns in mind. They were roomy, the stabilizer still worked, and the gun was easy to service. None of that was true with the Firefly tanks. When you look at the guns, the M1A1/A2 gun was a better overall tank gun, it didn’t perform as well in the A/T role, but it did well enough.
The M4A3 76 HVSS tank would go on to become the prefered US Army version of the tank and see extensive National Guard service, and would see combat again in Korea, but was retired to training and National Guard use soon after Korea ended. The Army would convert many M4A3 75 HVSS tanks, M4A3 76W VVSS tanks, M4A2 HVSS and M4A3 HVSS 105 tanks, were often converted to M4A3 76 HVSS configuration.