1939 only 9N
- Cast aluminum grill with horizontal slots.
- No freeze out plugs on block.
- 2-ribs on fender.
- Approximately first 700 tractors equipped with cast aluminum hoods.
- Ignition key switch on right side of dash.
- 2-brush generator.
1940 9N
- Single rib fenders.
- Freeze out plugs are now inside of block.
- Single rib fenders.
- Ignition key switch is now on left side of dash.
- 3-brush generator.
- Hinged battery lid introduced to replace the clip held lid (mid year).
1941 9N
- 3 spoke steering wheel (covered spokes) first used.
- Steel grill with vertical spokes.
- Riveted rear axle hubs replace the 'smooth' rear axle.
- Ignition key switch is moved to steering column.
1942 9N
The 9N parts were being used up to build the 2N.
1942 2N
- 3-spoke steering wheel (w/ exposed metal spokes) first used.
- Grill now has slotted center bar.
- Hood side panels have exposed bolt to retain to front axle support (mid year).
- Front emblem has '2N' on lower edge of emblem.
- Fender mount holes in rear axle housing are no longer solid, the are opened up between upper and lower vertical hole.
1943 2N
- Pressurized radiator is introduced (mid year).
- 32" tires are no longer offered.
1944 2N
- Trans input shaft gear is changed to helical cut (mid year).
- Oval style radius rods replace the solid 'I' beam style rods (mid year).
- Sealed beam headlights first offered.
1945 2N
- Heavier rear axle housings introduced (mid year).
1946 2N
- Rear axle housings are improved by making them thicker again.
1947 2N
- Casting number and date added to engine block (where starter bolts) to rear axle housing.
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