From Shorpy.com …
Accompanying caption:
"August 1941. Warren, Michigan. “Tank manufacture (Chrysler). These are partially completed M-3 tanks, 28-ton steel giants being turned out at the huge Chrysler tank arsenal near Detroit. The camera was directed toward the end of the three main assembly lines. Mass assembly methods developed in automobile manufacture are used. Note overhead cranes for heavy parts.”
Good find! 
The assembly sequence of major parts seems to be engine - turret - tracks.
Click the image to view the full size picture …
Did you notice the turret baskets setting beside these hulls? That plant later became part of G.M.'s tank building affair. They built a few M1 tanks in it to help the Lima production out, and think it shut down right after Desert Storm. Never was in it, but had the invite.
gary
