How to Measure THE LENGTH OF your driveshaft
We're often asked how to properly measure the length you need a Driveshaft made to, so we've provided a general guide to ease in this process:
Things to remember:
- Make sure there is weight on the vehicle when measuring for the driveshaft
- Ensure the Transmission Yoke is fully installed when measuring (we will compensate for the standard slip when we build your shaft)
standard 1pc Driveshafts:
Measure from the Center of the installed Transmission Yoke to the Face of the Pinion Yoke
Standard 2 pc Driveshafts:
Install the Transmission Yoke as described above. Measure from the Transmission Yoke to the Mounting Holes for the Carrier Bearing (Front Shaft) and then from the Mounting Holes to the Pinion Yoke (Rear Shaft)
Measuring driveshaft Angles
The operating angle of a u-joint is the relationship between two slopes, such as the transmission slope and the tube slope. If you imagine two lines parallel to each component, the angle where these two lines meet is the operating angle. (Angle A, Angle B, Angle C).
High angles combined with high RPMs result in serious vibration problems and reduced u-joint life. Driveline angles should be equal to or within 1° of each other. When checking driveshaft angles, be sure all tires are inflated to their normal operating pressure. Park the vehicle on the surface which is as nearly level as possible both from front to back and from side to side. Also remember to check driveshaft angles while the vehicle is unloaded, and again when it is loaded. This can tell you a lot about operating vibrations that are only present under certain conditions.
Using an ANGLE MASTER, determine the operating angles by placing the instrument on the driveline components. Begin with the transmission and work toward the axle.
To calculate operating angles follow these five easy steps:
Place the unit on the first slope (Slope A) and allow the reading to stabilize approximately 10 seconds.
Push the "Alt Zero" button.
The display will read 0.0° and the "Alt Zero" button indicator will flash. The slope you are using will be the new reference.
Move the unit to the next adjacent slope (Slope B). The reading obtained is the operating angle of the two slopes (Angle A).
To obtain additional operating angles, push the "Alt Zero" button again, and then repeat the above process starting at the second slope (Slope B as the Alternate Zero and measure Slope C to get Angle B).
NOTE: For maximum universal joint life, angles should be 3° or less.