Cowman, I think you are correct in that IH most likely used a lot of standardization in these shafts except for lengths. I don't know the minimum length required as the rake is all disassembled and painted ready for reassembly at this time so this cannot be measured presently. The shaft on the NOS rear piece is the solid rectangular one in shape being 11/16" X 13/16" and it has the smaller diameter shield being what looks like 1 3/4" diameter on the outside. I believe this would make it the end that slides into the front portion which would be the square tubular shape something like 3/4" X 7/8" on the inside. I'm thinking the front shield would also be on the outside but don't really know. If that being the case I believe the front shield ID would have to be something a little greater then the 1 3/4" OD of the rear shield. The PTO pieces for the Super C application have a larger diameter shield and I haven't checked to see if the two shafts are the same for both combinations but they appear to be the same and I know they are both rectangular in shape as well. From looking at my part catalog I believe the back joint assembly I obtained from the Depot appears to be what is called the Rockwell Standard version in the catalog. It still has the original IH part label attached stating the correct part number and the chain drive sprocket on the rear which pins to the drive shaft is correct as well. If you find something you believe is compatible let me know as it could be cut to length in combination with what I have for a complete IH PTO shielded joint drive assembly. The Farmall 240 tractor has the larger size 1 3/8" spline PTO shaft so that front coupling will have to be sized for the larger shaft. If you need some better dimensions I can provide them tomorrow when I'm out and can get some calipers to obtain some very accurate measurements. Thanks much for getting into this matter and hopefully we'll find the perfect combination. I have a few parts from the rake here in my den including the rear PTO joint assembly which Carol is now calling the IH Parts Warehouse, Hal.
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