Like Spooler said. I have the OS Giken too. At low speeds. It does make some flunky noises, and behaves differently then what you are used too. It will put the power down.
As for diff temps. I have a SpeedHut diff temp gauge installed. I can watch the diff temps. Driving to the Dragon this past weekend. 85 mph for hours on end on a 85F day. The most I seen was 255F. I have the MA Motorsports diff cooler installed. I turn the cooler pump and fan on. I watched the temps go from 255F to 185F. Driving on the Dragon. The most I seen was 215F in 11 miles.
Did you get the Z1 diff cover too? It holds an extra 1/2 quart or so.
Use the fluid for it. When you change it. Have a good hand pump. The stuff is thick. Some have used different lube in it. And have reported some issues will low speed operations being more pronounced.
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