Drive shaft alignment

[Rawze]

(08-08-2021 )stevegrutz Wrote:  U joints need to have a operating angle to them. If u joints operate at a zero angle the needle bearings wont move around and u joints will wear out prematurely.

here is one reference...

Quote:U-Joint Angles - U-joints need a slight angle for proper lubrication. Without the correct angles, the needle bearings in the u-joint caps do not rotate. Those needle bearings need to rotate in order for the u-joint to operate reliably and smoothly. These u-joint angles should always be at least 1-degree to avoid wearing out the yoke bearings ...

ref: https://www.therangerstation.com/tech_li...gles.shtml

and there is another reference in the "Drive-line Install Manuals" from Eaton-Dana. It basically states that ...

Quote: When installing a midship-mounted PTO, auxiliary transmission, or midship-mounted pump into the main driveline of a vehicle,install it at the same angle as the transmission. Keep the offset to a minimum to reduce universal joint operating angles.

Note: Do not make the universal joint operating angle less than 1/2 degree.
...
If the device ends up being installed in direct line with the transmission, with little or no universal joint operating angle on thejoints, raise or lower it so there is enough offset to create the required 1 to 1-1/2 degree universal joint operating angle on eachend of the driveshaft
...

ref: https://www.waterousco.com/media/wysiwyg...1-DSSP.pdf

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maybe this adds to the conversation.