The two disc design was upgraded to three around the time that the 45 replaced the WD. It fits in the same space, so seems a little less prone to slip, although it does give more viscous coupling or drag with cold &/or dirty oil. The additional discs likely give much more use between clutch replacements, as splitting tractors back then wasn't very convenient on the farm and might prompt leaving the tractor in a fence row in favor of a newer model. For infrequent light use, you might get away with a two disc clutch pack.
Use 80W90 oil in the big reservoir that serves the differential, transmission, wet clutch and PTO reservoir.
BTW, if the oil in the rear end is actually milky from water, the most common source is rain squeezing past the rubber dust cover on the gear shifter. This post was edited by stu (ON) at 08:01:23 12/25/12.
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