the d6 5r and 4r used the d4600 engine not a d-318, i have no idea about the clutch questions you're asking, you could definitely repower a dry clutch d68u9u with the d4600 from a 4r5r d6. you would have to change the air cleaner assembly, and the exhaust locations in the hood. intake manifold on the d4600s was on the opposite side of the d318's and the pony exhaust was different as well. the dry clutch assemblies were the same as well between the two, ihave never heard of someone adding the wet clutch to a d6 5r 4r, or to the graders. i don't know if the oil pan from a d4600 will fit on newer d318. the engines themselves are significantly different, i'm not sure if there are similarities in the base block design.
The oil clutch configuration is entirely different on a grader (foot clutch) than what was used on tractors.
There is no 3T #12 grader, it would have to be a 9K or 7T to have the D4600
Can't tell you for sure about the D4600 to D318 conversion on a grader but for the D4 conversions it requires changing the flywheel housing and using the older flywheel to work.
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