are you sure she's a 39? 9n?
she's got oval radius rods.. those are a post 1944 option... meaning 2N
she also has the rivited rear hubs.. those are a later option.. but were offered as upgrades or repalcements for he cast solid hubs that broke out due to voids.. so that one is less of a determining factor.
what do date codes on various parts say.. like axle trumpes?
engine sn? ( engines can be swapped.. might have a 39 engine in a 44-46 chassis.
where are the grease fittings on her front spindles? fore or aft?
I also see a thumb interlink start switch.. not an option on the very early units ( nor would steel sheet tin be either ).. also no trans dipstick in the tranny cover.
post back.