Drive shaft

Imagine two "C"s back to back, that's how the driveshaft should look assembled. Say the yoke halk on the engine output is horizontal, the first driveshaft yoke verticle, then the second or rear drive shaft yoke verticle, and the rear axle yoke horizontal.

Using keys here, it would look like this ...

Motor-- >---drive-shaft---< --rearaxle or differential

Hope it helps.

It's becayuse U joints are not constant velocity joints, the driven half or yoke's speed is the same average speed as the driving yoke's, but the driven yoke's speed fluctuates slightly, speeding up and slowing twice each revolution if there is any angularity involved.
 

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