Question about 1987 GMC R3500

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Have Mack 12 speed gearbox from R model with broken selector for on top,rear case needs to be unbolted in order to slide out selector shaft. Do we need special tools or with block and tackle can this operation be done in our own workshop with our standard tools.

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If I am reading your post correctly. You wan't to split
the aux. transmission from the main, just enough to
change the shift rods. I don't rember the last mack I
did it's been a while. The last one was a quad box in
an autocar. That was done on the floor, by blocking
the main with pieces of 2x4's+4x4's and using a
home made flat cart under the aux. But I think you
want to do this in frame. In that case you will need
a transmission jack. If the mount is under the main
use the jack to slide the aux. back. If not suspend
the main with heavy jack stands. And if needed a
heavier piece of channel iron. Also do not do this
alone. Make sure you have plenty of help with you.
One time I did not. But lived to warn about it.
Hope this is of some help. Be careful.
Good luck.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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Pictures of removing gearbox and transfer case from vehicle


REMOVAL & INSTALLATION CAUTION
The catalytic converter is located beside the transfer case. Be careful when working around the catalytic converter because of the extremely high temperatures generated by the converter.
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  2. Raise the vehicle and support it safely.
  3. If so equipped, remove the skid plate from frame.
  4. Drain the transfer case.
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  11. If equipped, disconnect the electrical wire harness plug from the Vehicle Speed Sensor (VSS).
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