Its not really viable at its BR, hull down position maybe but
This thing has 0 armor aside from the turret, basically 0 mobility
Yes ik it has m829a1 but its just die when seen because unlike abrams turret ring which is already under perform the turret neck of this thing pop out like a sore thumb which make u sometimes cant even hull down(the turret neck is also modeled wrong-Community Bug Reporting System)
But 120S historically were only given 750hp engine
No actually the full package of it were given the General Dynamics Land Systems AVDS-1790-9 diesel developing 1,200 hp (890 kW) and Allison X-1100-5 series automatic transmission and an upgraded suspension to help with the increase of power/weight ratio
Quote "The upgraded suspension coupled with the improved power-to-weight ratio gives a faster speed across country and a more stable firing platform as well as a better ride for the crew.
If required by the customer, the torsion bars could be replaced by hydropneumatic units for improved cross-country ride as well as saving some space inside of the hull.
The upper part of the suspension is fitted with new ballistic skirts and new sponsons are provided for additional storage such as batteries and, if required by the user, additional diesel fuel. These sponsons give a much smoother outline.
The fully functional prototype of the 120S retains the standard M60 series power pack consisting of a General Dynamics Land Systems AVDS-1790 series diesel engine developing 750 bhp.
It is envisioned that production vehicles would have the more powerful General Dynamics Land Systems AVDS-1790-9 diesel developing 1,200 hp. This would be coupled to the Allison X-1100-5 series automatic transmission and M1A1 final drives.
This engine has already been produced in production quantities for the now BAE Systems, Ground Systems Division (previously United Defense) M88A2 armoured recovery vehicle and the Merkava Mk 3 MBT. General Dynamics Land Systems will offer the AVDS series engine with or without the digital electronic fuel-control system."
Also noted the engine deck was modified from the start so it could be given the 1200hp engine if needed
With it being said it would give the 120S around the speed of the A1/A2 or if for balance issue around sub 62-65 and reverse of ~30
Sources: Army Guide
Transmission sources: https://docs.tuyap.online/FDOCS/40566.pdf
It would help the 120S alot
But wouldnt it be unbalance? No, generally the 120S if it was given the 1200hp engine will make it balance, due to it trade off the very weak hull armor of the m60 and given it also slower than the TTS
If it was to be balance Gajin could remove the m829a1 round and replace it with KE-W or slightly slower the reload speed of the 120S by 0.1-0.3 sec because the internal of it is a bit cramped
Lemme know what you think