Difference between A and BN?

I"m interested in every detail of the differences between A, B, and BN. I do understand that a BN is a narrowed rear-end B. Also, why are some B"s called "Cultivision" on the name decal, and some are not?

Thanks!!!!

I've seen what looks like 3 different versions of the B. First the tractor that is close to 8' wide having long extensions being the B, and a second one with shorter extensions that I gathered was the BN. Am I right so far?

There is a tractor a short distance from me, decal calls it a BN, it has narrow front, but at the rear the final drive assemblies are identical to the A. He indicated to me the tractor is very dangerous as he has upset it to the left several times. Both rear wheels are pressed steel, thus I imagine it is rather unstable. He indicated he had a Super A at another farm with a A-22 sickle mower. I'd almost bet the SA has 2 cast wheels. My question, is this B a real tractor or is it something someone has built from parts? My thoughts are this was a BN and someone broke the left extension found a short shaft and put it back together without the extension.

The final drive housings on the A and B are the same. The only difference is the length of the axle extensions between the differential and the final drive housing. That, and the fact that the B/BN is supposed to have one on the left too.

Somebody, somewhere along the line, removed the left axle extension and used an A axle shaft to narrow that BN up. It's not stock, as even back then IH would've been sued into oblivion for producing a tractor that rolls over on a whim like that. If you poke around this guy's place, I'm sure you'll find that axle extension laying in a junk pile somewhere, or under the work bench...

A B should have two pressed steel wheels stock. There would've been no need for the cast wheel on the right because of the left axle should be sticking out to keep the tractor stable.

Harold H

4 inches on each side. The differential shafts (the thing many people erroneously call an axle) on a B are about 22 inches and on a BN they are about 18 inches. Other than that, just the things that need to be different to accomadate the different lengths, such as: right side seat mounting bracket, draw bar, pedal guard & the foot plate.

A, B & BN use the same engine, transmission, seat, fenders, final drives, wheel weights etc.

Cultivision was a marketing term.

Want to learn? Watch this forum. There are several on here regularly, (such as Jim Becker & gene bender just to name two) who are very knowledgable about these little Farmalls.

You asked about the difference between an A and a BN, my brain answered with the difference between a B and a BN.

Sorry

scotty