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10*4. Thanks.

Check out this pdf & let me know which one ya think is best. I'm thinking Amsoil Severe Gear 75w-140 (even thou they only test 75w-90's mainly in these tests). http://www.amsoil.com/lit/g2457.pdf

What makes you say 200*? I'm running Lucas Heavy Duty 85w-140 & a quart of heavy duty oil stabilizer. Hows the upper part of the chunk lubricated? Does the bull (ring) gear just sling it up there?

What speed do you average on the interstate runs?

I can hold my hand on it for about 5-8sec. Got a digital IR temp sensor to get accurate temperature. Yes, the front still spins. Don't have my Ouverson manual lock out hubs yet.

Ambient temps been around 87*-95*. I know 65MPH is alittle speedy for Rocks.

Whats the normal operating temp for the 2.5 Rockwell axles differential/chunk (mainly the rear b/c I don't have front driveshaft hooked up all the time) & what temp is considered "not" to exceed. After about a 30 mile run at 60-65MPH my pinion nut on rear is pretty warm. I'm not asking about hub...