1. The document discusses formulas for calculating torque on transmissions, the service life of rear axles, and the service life of clutch plates. 2. It provides the specific formulas M = F Γ R for torque, Lr = mf. L/m for rear axle service life, and formulas for clutch plate service life as a function of load and time in use. 3. The document is authored by Fanji Wildanu for a mechanical engineering assignment on August 20, 2014 citing online sources.