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Old 01-28-2004, 08:07 AM
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90 degree offset u joint caps??

Hello I ran across this one and do not understand it...."a common mistake made on multiple piece driveshafts especially the early gm 2 piece is phasing. The u joint caps must be turned exactly 90 degrees from the preceding driveline section" .......If they are talking about assembling the two sections together, then this does not apply to me since I am pretty positive that the two sections will only go together one way., if thats not what this person is talking about then I am clueless

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Old 01-28-2004, 08:57 AM
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This has to do with u-joint orientation or phasing which is an effect of the amount of angular displacement the u-joints will see. Putting them out of phase by 90 degrees allows the joints to go through the driveshafts rotational (angular) displacement without binding. This is applicable if you are building a NEW driveshaft. If you are just rebuilding one all of this has been taken into consideration and all you need to do is put it back together...
Mark
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Old 01-28-2004, 09:02 AM
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Your U-joints should always be in the same plane as each other, and on a single tube driveshaft either with, or without a slip yoke.

That statement is also meant for driveshafts that include a carrier bearing in the center of multiple shaft assemblies, mostly in limousines, pick-up trucks and larger vehicles, where a single tube driveshaft would be too long and heavy to make it practical.

Sometimes the tube sections can be splined together in a way that doesn't keep the U-joints in the same plane for example ++x or x+x, as opposed to the joints in plane XXX, or +++.

Having the joints in the same plane as each other reduces premature wear, and certain driveline noises.

This whole subject is not a problem if you are NOT building your own driveshafts, any competant driveline shop already knows this information.

Last edited by M&M CUSTOM; 01-29-2004 at 03:05 PM.
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Old 01-28-2004, 07:29 PM
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Unless it is a 2 piece drive shaft set-up with splined shaft where they go together, and they are taken apart and put back together it should not be a problem. They can be put back together wrong in some cases. Like M&M said, any competant shop should know how they should go together if they are building one.
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Old 01-29-2004, 10:29 AM
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In my Chevy truck book, it states to rotate the rear section of my 2 piece drive shaft 3 splines clockwise before installing. This will put the front and rear sections out of "phase" as has been discussed earlier. They go on to explain why they want it that way, but I don't do it.

As stated earlier, MOST slip joints in 2 piece shafts only go together one way, and the driveshaft shop usually puts all the u-joints in the same alignment. BUT!!! If you get a new slip joint, as I recently did, it may NOT be "keyed" to go together only one way, and must be marked before pulling it apart so the shaft stays in the same orientation as it was when balanced.
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