Posted by ScottyHOMEy on October 02, 2008 at 11:01:23 from (71.241.192.129):
In Reply to: Farmall A or B? posted by chickenfarmer on October 02, 2008 at 10:46:47:
Looks can be deceiving.
My neighbor has a 1940 A sittin' out waitin' its turn in the shop. Its rears are set out as wide as they can possibly go and with no fenders, it looks almost like a B until you see the wide front on it. You may just have a B that's set in quite narrow.
First place to look would be under the seat, on the inside of the left-hand seat support bracket. If the serial number plate is still there, it will show a model number. Ser. # will still start with FAA, but there should be a model number on another line.
An A will have a housing to enclose the differential shaft on the right side. It's the cast piece between the tranny and the final drive -- what the floor ban bolts up to at its rear edge, which also makes the width to put the seat on that side. On the left side of the A, there is no such housing -- the final drive bolts right up to the side of the tranny.
On a B or BN, you will have the diff shaft housing on the right side, just like the A (the BN will be the same width as the A, the B four inches wider), and a matching housing on the left side of the same width as the one on the right.
Another thing to look at is how the seat mounts. On all three, A, B, BN, the left seat support mounts directly to the tranny. On the A and BN, the right seat support bolts up to the final drive (same holes as the fenders if it has them). On the B, being wider, the right seat support rests on a bracket mounted to the floor pan a few inches in from the edge of the final drive.
Which is not to say that you might not have a hybrid of some sort. It's not unheard of for folks to have put a narrow front from a B/BN onto an A.
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