After Volvo acquired BM, the same tractors were manufactured both in dark green as BMs and in red as Volvos. In some models, the difference was also that BMs had semi-diesel or diesel engines, while Volvos had carburetor engines. In 1959, a new tractor factory was established in Eskilstuna, and the model ranges were unified. Both brands had Bolinder diesels, although in BM tractors the engine was green in color.

The BM Volvo T 350 Boxer, introduced in spring 1959, replaced the earlier BM T35/36 model. As the model number suggests, the new tractor had 3 cylinders and a power output of just over 50 hp. The torque figure is still respectable in its power class even today. The transmission had 10 forward gears and 2 reverse. The clutch was 13 inches in diameter, meaning it was generously sized. The power take-off was independent of the driving clutch. A differential lock was standard equipment. The Boxer was thus a quite advanced tractor. A total of about 40,000 units were produced, the highest number in Scandinavia.

In 1961, the hydraulics were updated to Terra-Trol, which combined a stepless position control and a draft control. In 1963, the power was increased to 60 horsepower.

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