1939-40 Chevrolet truck
They had same cab in most through ton and a half and hood.Grill same a lot but taller in some.Fenders allways bigger above 3/4 ton.If wanting fenders know the size before hitting swap meets or bone yards.Back in the 70s at a big swap meet a guy had near perfect fronts for 37 chevy pu it said on tag.Had asked to be sure and he asured me pu.When I took out my tape and put it across open fender he says fast"maybe ton and a half!"Not everone is honest.They were ton and a half.Most are honest but beware.
Dodge for sure.
It's a Dodge. that cab would make a great hot rod. Trucks back then all had the same cab, regardless of chassis size. Looks like a work horse.