Heavy vibrations

[Cdubvw]

Does not happen when stopped only when driving about 55ish mph. What do you guys think about this. The rear driveshaft has 3.5” of splines exposed when installed. Maybe there isn’t enough engagement here? But would that mean at the same rpms the problem would be present and not speed dependednt?

[LockDoc]

Originally Posted by Cdubvw

Does not happen when stopped only when driving about 55ish mph. What do you guys think about this. The rear driveshaft has 3.5” of splines exposed when installed. Maybe there isn’t enough engagement here? But would that mean at the same rpms the problem would be present and not speed dependednt?

That looks like a lot of exposed splines too. If you push up and down on the shaft in that area can you see movement between the rear and front shaft? When you shifted the shaft forward it would have made that worse.

I think I would start over on that whole shaft and re-do it, front & back.

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[Cdubvw]

I think that’s what I’m going to have to do. I just hope I’m not spinning my wheels thinking it is the driveshaft. I talked to my father in law about it ( he owned it from 96-2016) he said that he had the driveshaft made when he swapped the engine and trans to a 350/th350 from the i6 and manual. To me it looks like the shaft is not long enough so i guess I’ll get a new one made up. I also talked to the guy who balanced it a few months back about phasing since his registration marks to put it back together made the u joints not in phase. He said that’s where h balanced it and to leave it that way. But is it even possible that this can be done? Can the shaft be properly balanced but out of phase?

[LockDoc]

Originally Posted by Cdubvw

I think that’s what I’m going to have to do. I just hope I’m not spinning my wheels thinking it is the driveshaft. I talked to my father in law about it ( he owned it from 96-2016) he said that he had the driveshaft made when he swapped the engine and trans to a 350/th350 from the i6 and manual. To me it looks like the shaft is not long enough so i guess I’ll get a new one made up. I also talked to the guy who balanced it a few months back about phasing since his registration marks to put it back together made the u joints not in phase. He said that’s where h balanced it and to leave it that way. But is it even possible that this can be done? Can the shaft be properly balanced but out of phase?

I would say it is too short overall. I don't know anything about the phase stuff.

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