I think I found there may be a way to tell the difference between an open diff and an LSD diff without taking the rear cover off. Underneath the diff, when you jack up the car, there will be a sticker that says M96 or M85. So far only one other guy and myself have confirmed that our open diffs have M96 on them but we'll need some more people to inspect their cars to confirm the assumption. Where you are looking is right under the nose of the diff where the pinion goes in. Please post what your door number says (BO2A=Open, BO2B=LSD, BO2C=LSD) and what your diff says (M85 or M96), thanks!
Here is the information we gathered. Now if you have an open diff in your IS and want to install an OEM LSD differential, you know what to look for!
Here is the information we gathered. Now if you have an open diff in your IS and want to install an OEM LSD differential, you know what to look for!
Thanks to 2JZ-adm for working with me on this and everyone who contributed!