Hi Parker,

You will find very little differences in the Durant M-2, M-4, and Model 40 and all have the W-5 engine....Their is a Model-40 repair manual in the Tech page which you can download....Their is good information on the Duo-Survo brakes....also
if interested some good modern inprovements like installing modern axle seal,ect...Just a few things I found handy when I restored my M-2/ M-4/ D-40 Durant Coupe.

Where Are You From? Leavenworth, WA / Yuma, AZ

Do You own a car built by Durant? '25 Flint H-40 2door / '25 B-40 Touring / '29 D-40 Coupe / '23 A-22 Touring