If you haven't already acquired a copy, I would suggest that you try to find a copy of Clive Law's Service Publications book by Andrew Iarocci titled 'The 3/4=ton SMP Truck in Canadian Service'
https://servicepub.com/product/the-3...nadian-service
I don't have a copy but other members may be able to describe the content. Its a book any M37CDN enthusiast should have.
Have a Merry Christmas and a Happy, Healthy and Prosperous 2018.
Jes