I believe (from what I've seen/remember) the GMC trucks with torque rods use a spring shackle at both ends of the springs. Those without the rods have the springs fixed front and shackles at the rear.
Not sure it's wise to remove the rods without also removing a shackle if that's possible? If it is probably takes some shimming for pinion angle correction without the second shackle.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-