The burden of proof doesn´t lie on me, but on you. However I´ll play along. Even in official materials there is absolutly not even a hint that the T-90M doesn´t have anything but the good old BKP transmission units. T-90MS was advertised with an automatic gear shifter (a drop-in device that replaces the traditional stick, shown below with the number 5) and an associated pseudo-wheel that improves controlability of the tank when turning (3).
The automatic gear shifter device is known as APP-172. Note that its not a new transmission per se but an automatic shifter, in other words, it just operates automatically the same 8 gears of the good old BKP units, one of those being the single reverse gear which achieves -4 km/h.
Here there is a demonstration of the automatic mode
However, the Russians cut this corner for the T-90M. The following pic is from the driver´s compartment, showing that the APP-172 hasn´t been installed. And even if it was, it would still had the same reverse speed.
To get better reverse speed, the BKP transmission units should be modified, and the best option is the one adopted for the T-84 and BM Oplot tanks which could be copied and applied to any other tank using BKP units just like that.
Addendum: a little more info on the APP-172.
"The automatic gearbox APP-172, proposed for installation on upgraded tanks, was developed in NPO “Electromashina”, part of the corporation “Uralvagonzavod.” The device is designed as a single unit with a set of necessary controls, which can be installed in the control department of the upgraded equipment. Installation of the machine and its connection to the necessary onboard systems can be carried out both in the factories and in the field.
The APP-172 system is able to track the parameters of transmission operation and independently perform gear changes. There are manual and automatic mode of operation. In addition, when the automatic mode of operation remains the ability to shift gears manually. During automatic operation, the machine spends on the gearshift order of 0,2 with. The machine connects to the on-board systems using a two-wire circuit and is installed to the right of the driver’s seat, in the same place as the regular transmission control systems.
On the body of the automatic device APP-172 there is a set of necessary controls. A toggle switch is provided to turn on the device with LED indication, as well as a movable lever with a scale that simulates a regular transmission control device. Thus, the use of the machine does not require complex retraining of personnel with the development of new equipment management principles.
The use of automatic gear, according to the developer, allows you to optimize the work of the transmission due to the correct management of it. Proper transmission control can reduce the acceleration time from standstill to 50 km / h on 2-3 with. Average highway speeds can be increased by 15-20%. The 10-15% reduces fuel consumption. Thus, the installation of a relatively simple and small device allows you to significantly increase the mobility of the armored vehicle and improve its performance."