RPM1941, little slow in responding but here goes. Last production wheel made for M up to and into early Farmall 400 was 6325DF. Wheel used a cast in key and the one piece clamp 6326DC used a cast in key also. Wheel and clamps fit a 2 keyway axle. Wheels for 400 tractors after serial 5180 and 450 ETC. used a wheel with a key slot for a steel key. 2 clamps 355440R2 without keys were used for those wheels. Later IH did make a replacement wheel 365345R1 for M to 400 serial 5180 that used the above key and clamps and the same rim as a M to 400 5180. 400 to 450 parts book lists axle 51572DC for both tractors with no note that early 400 wheels won't work with the axle. Finally if you look in attachments parts book section for a farmall 450 under the special axle extentions. Note says when this attachment is used on tractors with one keyway axle 51572DC with 2 keyways must be installed.
Axle 51572DC = two keyways.
Also you mentioned rear axle housings and I also in another post. I agree the 560 axle housing was used as a replacement for previous tractors. Only thing I pointed out is if someone decided to get a left side M housing at a salvage yard to put on a 560 that just a little work may be needed (grinding) to bolt the 560 T/A lever bracket on the best. When bigger diameter brake covers were used on a 560 the bracket was moved from the side of the transmission housing like a 450 was. On a 560 2 bolts that also mount the axle housing were used to mount the bracket. Two machined flats were added to the 560 housing at the outside of bolt holes area that previous housings don't have.
This post was edited by D Slater at 16:44:04 10/06/12.
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