Any progress on Driveline Vibration issue?

[Flash1034]

Mine is still doing it at freeway speeds. I was wondering if the rear axle shafts could be out of round?

 

[jelag]

Take the drive shaft out of the truck and take it to a Drive Shaft Shop that works on Class 8 truck shafts... let them test it for out of round and balance it... I'm guessing $80-120 and be done with the problem.. I've had to do this with earlier trucks I've owned... I've never found a dealer with the staff with enough knowledge to actually test and diagnosis this problem...

BTW - I always lift my trucks rear wheels off the ground... use some emery paper and clean and paint it... they look nasty full of rust...

Just my thoughts..

 

[Flash1034]

Mine is a one piece aluminum shaft.

 

[cerberusiam]

Which aluminum shaft? The OE aluminum ones can still suffer from harmonics that cause vibes.

If you are still running the flange on the rear diff there is a good chance it is the issue.

 

[Flash1034]

Yes, the OE aluminum, one piece driveshaft. I haven’t changed a thing, other than a leveling kit. No changes to the rear at all. What do I do about the flange?

 

[cerberusiam]

If it is actually the flange then the only way to fix it is replace the flange and yoke or get rid of it. Have you tried flipping the yoke 180 degrees to see if anything changes?

There are open u-bolt yokes for the AAM axle but the take a 1480 joint rather than the AAM 1485. I am not sure how trying to mate those together would work for efficacy. That is usually done in conjunction a custom 5" drive shaft with Spicer joints. It is almost impossible to tell if the vibe source is the DS balance, harmonics, flange alignment, or a combination thereof.

My truck was little easier to diagnose. A lot of was the steel DS and center support, the 1 piece OE DS solved a lot of it but not all. Since I could never get the rear diff seal to quir leaking figured it had to be something with the flange and it was. A custom DS from Texas and u-bolt yoke stopped the pinion leak and smoothed all the vibes.

 

[dfb]

All mine did it on take off..

 

[Flash1034]

Hmmmm....thanks for the great info. I’ll look into that. I’ve suspected the driveshaft as the source of the vibes since the start.