How to disengage 4wd on 89 Suburban?

Wife just got an 89 Suburban to replace our newer less impressive one.  A friend told her that she needs to drive in reverse 30 feet to disengage 4wd after using.  I have never heard of this.  It does have automatic hubs, and it 'seems' to properly disengage when simply shifting back to 2wd.  Is this reverse 30 feet thing legit?
LVL 10
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

I had one of those.  I loved it and miss it to this day...

No, there is no need to back up after disengaging 4wd.  That would kind of defeat the purpose of putting it into 4wd to get through something, just to have to back up through it and start all over again...

Is it not shifting out of 4wd properly?  

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
If you have a problem with shifting in / out of 4wd.
Call: Owner Help 1-800-222-1020
jasfoutAuthor Commented:
Thanks, I have also sent an email to chevy, for further confirmation. Waiting for response.
jasfoutAuthor Commented:
Just to clarify with my response from Chev:
Any 4wd model with 'Automatic Hubs' that protrude out from the wheel similar to the manual hubs require you to stop to initially engage 4wd & lock front hubs.  From then on you can  switch back and forth 2-4-2-4 while on the fly.  To completely disengage 4wd by unlocking the front hubs, you need to drive in reverse 15-20 feet while in 2wd
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.