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i mentioned this in my build thread as well, that after a lap or two of drifting it would pee a little out the breather. bill also has this in his build thread as he added a diff cooler and pump to his setup. i spoke to a 4x4 buddy of mine who wheels yotas, and apparently its very common for a wide range of toyotas to have this problem. apparently for 4x4 guys they have an accordion breather valve that when hot, expands, and when cools, comes back down. i had been thinking about doing a cooler on mine and use the internal pressure to move the fluid as i didnt want to add a pump, but i feel having a pump on a switch while drifting would benefit the life of the diff as well as the bearings etc. oddly the 7.5 solid axle diffs in the corollas in my neck of the woods who drift, havent had this issue...or known about it
 

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Solid axles hold more fluid, and have more surface area to expel heat.
 
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