How To Measure Driveshafts

Accurately measuring your driveshaft is an action to be taken seriously. When your driveshaft is not accurately measured you’ll experience premature wear and reduced performance in your vehicle. However, this guide will easily teach you how to measure driveshafts.

Drive Shaft Configuration

What drive shaft does it to transmit torque and rotation from your vehicle’s transmission to the differential, and then the differential sends it to the wheel. Various types of drive shaft configurations are produced to best suit your vehicle.

Front-Wheel Drive (FWD) Systems

You will find front-wheel drive mostly in compact cars and some midsize cars. In this driving configuration, the drive shaft is what links the engine to the front axle, and the front axle directs the power of the engine to the front wheels. 

Four-Wheel Drive (4WD) Systems

This type of drivetrain arrangement uses the four wheels of a vehicle to receive torque from the engine. You will find four-wheel drive on off-road vehicles, trucks, and SUVs.

Rear-Wheel Drive (RWD) Systems

In this case, the rear axle and the engine are connected through the driveshaft, then the rear axle transfers the power of the engine to the back wheel. RWD gives better acceleration, and weight balance distribution.

All-Wheel Drive (AWD) Systems

This type of drive system gives power supply to all four wheels simultaneously for stability and traction in different driving situations. Various drive shafts work together in an all-wheel drive system to supply power between both the front and rear axles for optimal control and power.

Understanding Drive Shaft Parts

Your understanding of the various drive shaft components and their functions inside the driveline will give you a clearer view of their value.

Center Bearing Support: The drive shaft load is supported by the center bearing support, and it permits radial and axial deflection during braking and startup. 

Couplings: A coupling is a stiff or flexible mechanical mechanism that transfers power and movement between identical or different shafts in machines. 

U-Joints: U-joint connects the differential and the driveshaft. It enables the drive shaft to travel literally or side by side to prevent any driveline from breaking. 

Differential Pinion Yoke: The differential pinion yoke connects the axle to the differential for the vehicle to be able to turn smoothly.

Drive Shaft Bolt: The drive shaft bolt is what secures the drive shaft to the axle flange.

Center Yoke: Center yokes specifically help to accommodate high angles and they are essential to ensure the CV head assembly’s overall correct operation.

Splines: These transmit torque and rotation, protect the angular relationships between the groove components, and they also give room to changes in length during motion in power-take-offs and driveshaft. 

Double Cardan Shaft: Double cardan shaft helps to bypass choppy rotation. 

Slip Yoke: Slip yoke is what transmit power from the transfer case to the driveshaft.

U-Joint Dust Cap Seal:  It is responsible for prolonging the lifespan of the universal joint and it reduces the need for frequent replacements. 

CV Weld Yoke: CV weld yoke is a piloting hub-equipped yoke that facilitates tube connection.

Drive Shaft Slip Yoke Felt: It prevents the slip yoke from liquid and debris.

Driveshaft: The driveshaft connects the parts of the drivetrain that cannot be connected directly.

How To Measure A DriveShaft

Below are the most common four types of measuring driveshaft configurations:

End Yoke To End Yoke Measurement: Measure from the center of one of the U-joints to the center of the U-joint of another.

End Yoke To Spline Measurement: Start your measurement from the center of the U-joints to the spline’s tip.

Flange To Flange Measurement: You’ll measure from one face of the flange to the other.

Flange To The End Yoke Measurement: This necessitates you to measure from the U-joint to the flange face from the center of the joint.

Getting yourself used to the terminologies and driveshaft components should be your priority. However, if you realize that you are finding it difficult to measure your identical parts, try to consult a professional.

Different Drive Shaft Measurements

If you want to replace or repair your driveshaft, then you will need to take measurements of your driveshaft length for you to be sure of the exact shaft you need from your supplier. If you still have your driveshaft you can bring it to the supplier for the measuring process to be easy.

However, if your driveshaft has a serious damage, that means you need to carry out the measuring process by yourself. Are you tense about this whole process? No, you don’t have to. Here is a simple guide to walk you through the process.

One-Piece Length Drive Shaft Measurement

Measuring a one-piece drive shaft is quite easy:

First, confirm that your vehicle weight is on the spring.

1. Then push your transmission yoke into the transmission.
2. Back it to your desired running position.
3. Lastly, measure from the center of the U-joint cap hole in the slip yoke to the center of where the U-joint fits in the rear end.

Two-Piece Drive Shaft Measurement

Follow these steps to measure the two-piece drive shaft:

1. Put the weight of the vehicle on its spring.
2. Push your transmission yoke into the transmission.
3. The next thing is to back it ¾” to 1” (you can also back it to your preferred running position)
4. Use your measuring tape to measure from the center of the U-joint cap hole in the slip yoke to the center of where the bearing is attached to the frame.
5. Lastly, measure from the center of where the center bearing is attached to the frame to the center of the universal joint in the rear end.

Four-wheel drive Shaft Measurement

To measure a four-wheel driveshaft when the shaft is missing is not difficult. See how to go about it below:

1. First, set your vehicle wheel on the spring
2. Then, measure across to the centerline of the transfer case yoke from the front differential yoke.
3. Proceed in the same manner from the transfer case to the centerline of the rear differential yoke.

FAQs

Do You Need To Measure Your Drive Shaft Before Ordering A Replacement?

Yes, you need to measure your driveshaft before ordering a replacement for you to receive the actual driveshaft for your vehicle.

Conclusion

Accurately measuring your driveshaft will help you minimize potential driveshaft problems and optimize your vehicle performance and your drivetrain integrity. In conclusion, when you consider all the precise measurements in this guide, you’ll avoid potential issues and find the perfect fit for your vehicle.