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Zuk,
They are the gears that you helped me through the setup. Yukon v6 4.88's. The pinion preload was 9 in/lbs. I just figured they should be broken in by now. The housing is still very hot to touch. You can leave your hand on it but it's very hot. I put some valvoline synthentic blend stuff in there that I had laying around the shop after about 200 miles. I'm planning to put redline in it once it's completely broke in. I guess the thicker oil can't hurt? Does it normally take this long for the temps to break the gears in to where the run at a somewhat normal temp?


Swamp---When I think of heat on a new install, I think pinion bearings and actual tooth scrub as the 2 areas that cause heat the most....carrier bearings are low on the "heat causers".
That said, synthetic will help prevent some of the pinion bearing heat so I think you should start using the Redline 80-140 right now.
Also, the quality of the pattern you developed can influence the heat from the scrubbing/sliding/rubbing that occurs with all Hypoid gears. Synthetic gear oils can reduce this heat also. Too little Backlash is a killer of ring and pinions 'cause no gear oil can make it between the tooth contact and heat shoots way way up. 7~10 thou on backlash is a safe range for the Yota stuff......... Did you ever shoot me a pic of the pattern? And what BL did you measure?

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01 Taco xtracab V6 auto TRD white
mostly stock
88 Runner/V6/auto/31"/5.29gear