Posted this for you on alt.trucks.chevy as well....If it's like my Z71
Avalanche, you must put the transmission in N before
shifting the transfer case into neutral. Trying it in Park won't do it. It
took me a while to figure this one out, and it turned out it was in the
manual. I think this is a common GM transfer case design thing, even though
my '04 Z71 has an NP246 AutoTrac case and your 97 Jimmy will be an NP233.
Thanks for the rapid reply. What I don't understand at this point is how to
get the transfer case to stay in neutral. I place the transmission into
neutral and any combination of button presses either leaves me in 2hi, 4 hi
or 4 lo. If I hold two buttons down together (2 hi to 4lo as an example)
nothing happens. I have verified that I am not into a transfer case neutral
by shifting back into park.
Or maybe someone else here can answer this, Can this be flat towed about
600 miles with just the transmission into neutral? I have been told by
others not to do it as it will burn up the trans.
Well I found the answer to my own question after researching (its called
googling). GM Service bulletin # 00-00-89-008F dated August 2006 reference
to towing, There is a section in there on vehicle combination / transfer
case combos, "T Trucks equipped with an optional electric shift 233 transfer
case, RPO NP1, no neutral position". Well that certainly sucks!
Can't be. No neutral on that case. Two solutions for flat towing 1. Pull
the straps on the rear U-Joint, wrap the joint with some tape to keep
the caps on. Tie it out of the way. 2. Buy one of the interlock kits
that are made to allow you to flat tow. Most operate like the axle
interlock up front.
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