The driveshafts are no problem.
The mounting stuff can be made from scratch.
I have been looking at shifters on cab over trucks, and I think one could be used for the 5831. Or an original could be found in a junk yard, but they are a little hard to find. I have also considered making one. Or perhaps the shift tower from a regular 3 speed floor shift transmission could be used if the shift rails were extended, then attach the linkage to them to go back to the spicer.

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-