Introduction of 400 type steering box

[Lauren Child]

350 box from the F15A illustrated parts list May 1943

*C01QF-3503 : Gear - steering assembly. Used to motor serial #2G-6921F.
*C011WQF-3503 : Gear - steering assembly. Used from motor serial #2G-6922-F to motor serial #5579.
*C11QF-3503-A : Gear - steering assembly. Used from motor serial #5580.

[Lynn Eades]

I have a copy of the (common?)blue covered 1940 to 1942 book which on page 66 lists 2 more options, and on pages 68 and 69 lists 2 conversion kits "Used to convert vehicles in the field, from truck type steering to the larger bus type steering". There is also a kit to raise the CO1QF steering by one inch.
I believe some models of these steering boxes would have been made by Gemmer engineering, as they have close similarities with the Gemmer boxes found in 3/4 ton WC series Dodges of the same era.