Perhaps some of the more modern synthetic oils will have a higher boiling point.
Most pinion gears are cut for forward movement. So there may be a little extra heat created by the gears. Also, how is the pump set up on the T-16 differential cooler. Is it trying to pick up oil from the dump side and pump it into the bottom of the diff? Just spitballing here...I have minimal experience with the T-16, but I do know that those diffs were used on snow machines like the Nodwells and have seen them with 8.2 liter detroit diesels powering them.
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