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I found "Rock" GL4 at a local bike parts shop here in little old Santa Cruz, CA. I have over 21K miles on my last "change" & when I looked at it last week you'd swear I just changed it!
 

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I just bought this!? Decent stuff?? Had crotch rockets before my "grown up" bike!?
Since this thread is over a decade old, figured I would jump-in. There are lots of things that work well. BTW its not a transmission (that runs in motor oil) its a Middle Drive. I use Redline MT-90 75w-90 GL-4 Full Synthetic Manual Trans/Transaxle since it exceeds spec and plays-well with the middle drive's oil pump. But almost any brand works well.
 

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There is no yellow metal (copper alloys) in the Warrior Transfer Case or Middle Shaft Pump.
IMO it's a carry over from their Shaft Drive Bikes :) so, GL4 or 5 will suffice for the straight cut spur gears and silent chain as well as the rotor pump.
 
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