ive searched around but cant find anything that looks like it. I came out of a jdm b series trans thanks. thinking of buying it on the cheap. ive got an oem lsd that I was gonna use the parts from this to fix but this is not OE. but if I can find the parts to fix this one that would work too haha

 

it looks like a cusco lsd

 

OBX

 

I thought obx too but I have seen one photo of one with the notches around the speedo gear like this one. Only one I've seen that looks the same is this one http://www.gearspeedwholesale.com/product_p/osk-gsr.htm

 

You might try the transmission subforum. Some if those guys have seen a LOT of transmissions.