The Arabic numerals in the fromwinch electrical cable winch model indicate the maximum pulling force. For example, the GEW 9000 of RUNVA refers to the maximum pulling force of 9000 lb (lb is non-legal unit of measure, 1 lb = 0.45359237 kg). The principle of choosing the fromwinch winch for 4x4 is generally 1.5 times the weight of the vehicle pulling force is appropriate. Such as the Cherokee's weight is 1600kg, then the winch pull should not be less than (1600 / 0.45) x1.5 (lb) = 5333lb, it is recommended to use 8000lb and above winch. Why? Because the winch model is rated on the maximum tension, but the actual use of this is a limit. If the vehicle for a long time under the limits of the use of the engine, will inevitably affect life expectancy. Also in the limit state, the winch cable will be pulled off, the motor burned the accident, will cause serious harm bystanders, the vehicle may also be out of control. fromwinch 4000lbs electric winch may be in the work of the tension is random and unpredictable, it should be possible to install a large pull of the winch is an endless pursuit of off-road enthusiasts.