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@mashton
I suspect that the OD pump needs replacing. One of the issues with it yesterday was that the pump had seized (as well as a raft of electrical fun, caused by a short melting some of the loom). If the pump isn't working perfectly, it seems to me that the oil pressure might be a bit low, causing the planetary clutch to be sluggish in engaging.
I'm told that the pump is meant to make 450psi, which is needed to engage the planetary clutch. Seems very high to me and would probably need a pump that is operating nominally.