The 2013 Peterbilt 320 is a capable truck powered by a Cummins ISL engine with 345 horsepower, ideal for versatile applications. It features an Allison AUTO 4000 SERIES transmission, providing smooth and automatic shifting. The truck includes a Spicer D46-170D front differential and a Spicer R46-170D rear differential, both with a 4.56 ratio, offering reliable torque handling and efficiency for a range of operations.