Never seen this model of chains ? looks , german , russian ?
"
but mobility became a big issue especially once the Allied front in France reached the Siegfried Line on the border of Germany, where the ground became very muddy in the fall season. An attempt to fix this was improvising "extensions" on the tracks, but these were difficult to add and there were never enough to go around. The problem had to be addressed in the manufacturing plant and Ordnance Department set to work finding a better solution to fix the track flotation for better mobility.
The result was to be the basis of the next generation of Sherman models. Under the
E8 program, new suspension was trialed on the Sherman, one was the horizontal-volute suspension system (HVSS) taken from the
T20 program. The trials showed that the new suspension gave the Sherman a ground pressure that is even less than the heavier Panther, and this model was approved for production in March 1944, beginning in August 1944. Despite the time of production, the distance of the Atlantic Ocean between the American factories and Europe cause the delivery time of the first batch of the new models to be three months, meaning they would not see service until December 1944 the soonest. Nevertheless, the new Sherman, dubbed the
M4A3 (76) W HVSS Sherman on papers and shortened as the
M4A3E8, was considered the best overall Sherman design with its new upgrades." . . .
" In-game description
Installing heavy weaponry and making other changes increased the tank's weight, also sacrificing maneuverability. In 1943 builders widened the T80 track to 23" and added a ridge down the center. The new HVSS suspension with its horizontal volute springs replaced the VVSS and its vertical alignment. Bogies had two paired wheels, and the supporting rollers were attached to the side of the hull. The HVSS suspension was developed such that individual wheels could be replaced without taking apart the entire bogie. The new suspension was installed beginning in the mid-1944. Wide-tracked tanks equipped with the new suspension were also fitted with wings and shelves with screens above the tracks.
The initial M4 tracks got a rubber-coated internal band, though the rubber shortage forced the use of two types of steel tracks, all of which were interchangeable. There were three types of tracks on the M4, and they could be fitted with spikes to make traveling across soft earth easier. The spikes were not used with the T80 tracks at the beginning, though they were later developed for them as well.
The prototypes were designated M4E8, M4A1E8, M4A2E8, and M4A3E8. Their weight grew somewhat, though widening the tracks to 584 mm counteracted that by spreading the weight across a wider surface. As a result, maneuverability not only did not decrease, it actually enjoyed an uptick. At the end of March 1945 all M4 Shermans began to be fitted with the new suspension.
Between August 1944 and May 1945, 1,217 M4А3E8 (76)Ws were produced.
M4A3 (76)Ws fought on the Western Front in 1945 and in the Korean War from 1950 to 1953."
Source -
https://wiki.warthunder.com/M4A3_(76)_W