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Old 01-31-2020, 03:19 PM   #21
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Originally Posted by NoHaveMSG View Post
Our diff is Toyota/Lexus based, not Subaru. The IS250 is the exact same housing, I believe Y31, I can't recall exactly. Built FI cars are abusing them without issue.
not sure the difference of Y31 vs Y38. but IS250 has Y31 4.1FD, Y50 is 3.909FD. brz/86 13-16 MT / 13+ AT have Y38 4.1FD , 17+ MT has Y58 4.3 FD,
IS300 has M85 3.73FD M98 3.91FD.

All share the same carrier/pumpkin and are interchangeable. no idea if any have different torque ratings or all are the same. but i dont think people have much issues with those unless your making like 300ft lbs with a slick and launching hard.
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