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There were no less than 8 different models of COE truck for 1939. That one looks like a longer version but I can't tell if it's a 134" wheel base or a 157" wheel base. They also were available with either the 85HP 221 CID engine or the 95 HP 239 CID engine. The 95HP would be preferable but a 221 would be OK too. By now it may have a later model engine in it anyway.
I think the 1938 & 39 trucks with 2-speed used the Eaton/Ford model 1250 manual shift two speed axle. Finding one of those babies and all the shifter parts plus the drive shaft pieces, might be a difficult task. Not to say it can't be done but definitely will take some poking around. It may be easier to find a later vacuum shift type. The axle can come from any Conventional or COE model truck but the drive line may require a shaft modification to get it to work. Nothing that hasn't been done before but it helps to have a good drive shaft shop around your area. Some of the 2-speed set ups also had a ratio changer mechanism for the speedometer so it would indicate some where near the correct speed.