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Sure enough got a new unit in and look at the front ds! I see this again and again! I guess they forget to mention this in 91B school!!!
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Check your Driveshaft phasing on FMTVs!!
- Thread starter NDT
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oboyjohn
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Seen this many times up here in Canada. One group of guys working on a HLVW 10 ton couldn't figure out why the T/case was wobbling back and forth. I took a quick look and the main drive shaft to the first rear axle was out of phase by a few spline teeth.
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Forgive my ignorance, as im not familiar with these trucks, but do they not have a keyed spline? On the driveshafts I've had apart (1 ton and down) there is usually a wide spline that fits a matching space in the other half.
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Nah, it will help shake the dirt off and keep the truck clean. Just send it. 
oboyjohn
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Hi Eric.
No, they do not have a keyed or master spline. Quite often I have seen them out by 90 degrees, but not too often by a few spline teeth. I learned early in my career to ALWAYS mark a drive shaft before taking it apart. If not, not only will it be out of phase but also out of balance, which will destroy a drive shaft in short order.
No, they do not have a keyed or master spline. Quite often I have seen them out by 90 degrees, but not too often by a few spline teeth. I learned early in my career to ALWAYS mark a drive shaft before taking it apart. If not, not only will it be out of phase but also out of balance, which will destroy a drive shaft in short order.
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Ok. Seems odd that they aren't keyed. I've always marked my driveshafts, as well. Just because.