Question about 1987 GMC R3500
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.
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
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