1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

Explain the G80 operation to me...

Discussion in 'GM Powertrain' started by steved, May 17, 2012.

  1. steved

    steved Former Member

    OK, I know its a hybrid of sorts...its primarily a locking differential, but I'm pretty sure its got clutches to activate the locking mechanism...how do they work? What gear oils is everyone using, and is there any brands that cause problems?
  2. SurrealOne

    SurrealOne Former Member 1000 Posts

  3. dsfloyd

    dsfloyd New Member 1000 Posts

    As I am sure the video states (I think I have seen it before but didnt watch it now:lol:) Basically it works like a limited slip. it is open until there is a detected wheel spin of a set speed. At that point it will fully lock as a locker would. It will stay locked up to a certain speeds (both on the upper and lower end).

    Ok so I watched the video again (good video). they said it a little more technical than I did
    Last edited: May 17, 2012
  4. steved

    steved Former Member

    OK, that makes sense; it operates like a Dana Trac-Loc but has the ability to add more load to the friction discs than that developed soley by the bellevue washers...so its a fancy limited slip, not a true locking diff by any stretch of the imagination.

    So it will be sensitive to the type of gear lube used...
  5. dsfloyd

    dsfloyd New Member 1000 Posts

    I use mobil 1. You just need to use a synthetic 75-90. Once it locks it is a true locker as it will send equal power to both wheels. The design tends to lead to alot of discussion on threads but technically speaking once the 100rpm difference is detected it fully locks, making it a locking diff.
  6. steved

    steved Former Member

    Fully locks using clutches...but there is no steel-to-steel contact like a true "locker" like a Detroit.
  7. Sierraowner5.3

    Sierraowner5.3 Active Member 1000 Posts

    good video. thanks for posting it surreal.

  8. SurrealOne

    SurrealOne Former Member 1000 Posts

    Happy to help....
  9. steved

    steved Former Member

    OK, when did they install a drain plug in these axles? I just found this today when I was changing oil...I assume its a oil drain plug and not some sort of gasket self-destruct screw?
  10. dsfloyd

    dsfloyd New Member 1000 Posts

    Ive got a drain plug on my 04 9.5"

Share This Page