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?
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jasfoutAsked:
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mikelfritzCommented:
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?  
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Michael-BestCommented:
If you have a problem with shifting in / out of 4wd.
Call: Owner Help 1-800-222-1020
Service: cac@chevrolet.com
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jasfoutAuthor Commented:
Thanks, I have also sent an email to chevy, for further confirmation. Waiting for response.
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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
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