[HO455]

Part of what determines the limits of drive line length is the intended usage along with gear ratio, tire diameter, transmission top gear ratio, engine horsepower. These factors determine the maximum RPM of the driveline as well as how much torque it will be required to absorb.

There is a maximum RPM that a drive line can turn at before it starts it reaches critical speed. The length, diameter, and material used in the driveline determine its critical speed. The critical speed is basically the RPM at which the drive line starts to whip or bend so it resembles a jump rope which can be felt as a vibration in the vehicle. Exceeding the critical speed will lead to driveline failure due to fatiguing of the driveline material. The longer time and/or the greater amount of RPM you exceed the critical speed causes the failure to happen sooner.

Spicer has calculator to help determine what the critical speed of your driveline would be.

https://spicerparts.com/calculators/...rpm-calculator

Then you need to calculate what the maximum RPM your driveline would turn at to see if you're in danger of exceeding the critical speed.

https://www.dennysdriveshaft.com/pot...alculator.html