well a fluid additive is good, but the hopping is the clutches slipping
loose in jumps to allow the axels to turn at a different reat when turning
in a tight circle.
this is a common thing even with an addative.
It will slowley burn the clutches and will eventually get easier.
i have driven vehicles with this(which is a common thing) for 120,000 miles
and still ok.
old john

Hello, captainvideo462002@yahoo.com!
You wrote  on 14 Apr 2007 06:12:56 -0700:

c> I have a 2000 Bravada that has the "hopping" problem during slow speed
c> turns such as parking lots, etc. The transfer case fluid has been
c> changed twice in 2.5 years, the last time being a year ago using the
c> recommended GM fluid. The hopping has gotten worse and a GM dealer
c> told me since I have a locking differential that I should probably
c> change the rear differential oil as well. The owners manual says to
c> only use GM axle lubricant, PN.1052271. There is no description of
c> what that lubricant is. They also give the same part number for the
c> front axle lubricant which is a standard differential  and call it
c> "SAE 80W90 ". When I called the dealer they tell me that my book is
c> wrong and that I need this special SAE 75W90 oil at about 29.00 a
c> quart. Now if someone could please answer six questions for me /i
c> would be extremely grateful:
c> 1. What is the correct oil for this axle?
c> 2. How much do I need for a complete drain and refill?
c> 3. Is there a drain plug on these axles or is there a plate on the
c> rear of the carrier that has to come off?
c> 4. How likely is it that a rear differential oil change may cure my
c> problem ?
c> 5. If this is my problem what is actually happening in the
c> differential to cause this?
c> 6. How much damage typically occurs from driving a car with this type
c> of symptom for any length of time and what will we notice?
c> Thanks very much for any advice. Lenny Stein.

With best regards, ajeeperman@comcast.net.  E-mail: ajeeperman@comcast.net