The BTR-40 was born from the modification of the GAZ.63 4×4 truck chassis, which was shortened and bodied with armor plates up to 8mm. The transport compartment did not have a roof and a tarp was installed in its place to protect the soldiers from the weather. They entered service in 1950 and were widely exported to more than 30 countries, which was a great sales success. In 1957 appeared the BTR-40B variant with armored roof and numerous improvements, specially designed for reconnaissance missions. In addition, there were several other versions, like BTR-40P tank destroyer, BTR-40Kh NBC reconnaissance vehicle and BTR-40A antiaircraft vehicle among others.
BTR-40 gallery and more info