The Sherman III/IV was an experimental hybrid between two Sherman vehicles Sweden acquired post-war from the UK, a total of four Shermans were bought in for trial and study purposes on foreign tank designs that could be useful for Sweden's own future tank development and acquisitions. The Sherman III/IV was most likely a vehicle testing how different combinations of the Sherman platform performed together and how interchangeable the parts are for repairs. In-game the vehicle is erroneously depicted with a Sherman IV hull while the real vehicle used a Sherman IB hull. When the tests were completed the Sherman IB and III were restored to their original configurations before eventually ending up at Axvall Tank Museum. When Axvall closed they were transferred along with the rest of the collection to Arsenalen where they remain in storage.

The Sherman III/IV was introduced in Update "La Royale" as a Swedish premium vehicle, which gave Sweden a Sherman of its own and would bolster the Swedish lower tier lineup. Sherman III/IV is played like most other M4 Sherman a good overall medium tank with a short stop stabiliser making it good for quick stops and getting the barrel on target. Sherman’s overall mobility is adequate to get around on maps, with angled armour making the vehicle more effective armour and the ability to bounce shells off the armour. But it’s still vulnerable to enemy fire if flanking and certain vehicles have high enough penetration making short work of the Sherman III/IV armour.