bjgtir

you are far better fixing up the underlying handling problem before you improve tyre grip. Improving typre grip first will only hide the problem. Fixing the handling while still using the poor tyres is easier as the change should be more apparent and also should be obvious at lower (ie safer) speeds brendan

For a normal type differential (ie with spider gears) the input speed is the average of the 2 output speeds. Saying the same thing in a different way, the tailshaft rotates at the average of the two output (half/drive etc) shafts. The spider gears allow for rotation difference between the housing and the spur (output) gears. It is not fixed as someone mentioned above. Just reread the original post. Ythe question "Does the diff absorb the 50% power loss" is simply imposible. A domestic electric cooking oven would typically have be a maximum rating of 8kW. Given that we are talking about cars with at least 100kW to the wheels, a diff would be cooked if it had to absorb 50kW.