That seems a very fair first test idea @poopsie Mate
Change to a smaller pulley on the Chev PS pump is what you mean?
Appeared I fixed my past situation by installing a Davies Craig circa 300x200mm cooler out front for extra capacity/heat shedding of the Nissan TD42 OEM PS pump but its only done 2-3 little trips before being parked up in the shed years ago
Please do keep us posted Brother


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