The first N series was the 9N with production beginning in 1939. 3 speed transmission, bevel gears in the steering gear box (drag link shafts in line), 19 or 21 x 3 front wheels with a very large bolt circle. Front distributor on the engine.
Because of difficultiess with materials the 2N has some changes from the 9N with production beginning in 1942. No differences in function, some were shipped with steel wheels.
The differences from 9N and 2N are small. Major parts interchange though axles and hubs probably don't.
The 8N came out in 1948. Engine still the same as the previous tractors, 4 speed transmission, ball worm steering gear (drag link arm shafts offset), small bolt circle on the front wheels. Rear wheel mounts changed.
In 1951 the 8N engine was changed to have a side distributor which makes tuning far easier.
The steering gear on the 9 and 2 kicks the driver severely when running over clods because there's no worm gear to absorb the shock. The steering gear on the 8N is far easier on the driver.
My impression (I used to have an 8N) is that changes were minimal during each model run over several years other than that last year engine change for the 8N.
My impression from having and 8N is that its a toy, and that tractors like the MF-135 will actually accomplish the work the 8N attempts.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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