# Is the crankshaft connected directly to the wheels?

If my understanding is correct, a car (in simple terms) has;

• The crankshaft, then;
• The clutch and gearbox, then;
• The propshaft, then;
• The differential, then;
• The driveshafts and the wheels.

Therefore, assuming the car is in gear and the clutch pedal is not pressed, surely turning the crankshaft would turn the wheels, and move the car? If this is not the case, which component can spin without spinning the component it is connected to (other than the clutch)?

• Are you assuming that both wheels are in contact with the ground? And what about an lsd? – Solar Mike May 25 '19 at 17:09
• You are correct. – HandyHowie May 25 '19 at 17:11
• @SolarMike Yes, I would be assuming both wheels are in contact with the ground - would this make any difference, although I guess if only one wheel was raised and the other was on the ground, the differential would make a difference? Likewise, would the differential (or type of differential) make a significant difference, as surely the wheels would still rotate, albeit with one spinning faster/slower than the other? – PhysicsGuy123 May 25 '19 at 17:14
• If one wheel can spin then the car may not move, which is why some have lsd... – Solar Mike May 25 '19 at 17:16
• Note, the layshaft is one of the shafts in the gearbox along with primary and third. – Solar Mike May 25 '19 at 17:17