This past weekend I spent a lot of time under the truck installing hitches, shocks, airbags and anti-sway bar. Although I had noticed it before, I got a good close look at the harmonic balancer on the pinion shaft.


Although the idea makes sense, this is the first diff I have seen with a harmonic balancer. Is this a Durmax-only item, a G80-only item, a crewcab-only item, or do all the trucks have these? I suspect only the 167" and longer Duramax trucks have these. Does anybody know?

You got me Frank, I saw it on mine and wonder how much that puppy will cost when it needs replaced?


I have never seen one on a drive shaft before. I'm sure they have been used, just not a common item.

My reg cab has one. At first I was like coolhttp://www.dieselplace.com/forum/smileys/Cool.gif Untill I figured it was some cost saving program to get rid of the need to balance it or something like that

its a vibration damper...helps with that big long shaft..

Must be an 11.5" rear thing, as my '04 10.5" does NOT have this.

All my HDs have had it.


I also like the steel drive shaft now over the older aluminum ones.