Hi, can anyone tell me the difference between these rear diffs? One is out of a ver4 type r and the other came out of a ver5 type r. The housings are identical they just have different internal mechanisms. What id like to know is if one might be an uprated part or just why are they different ?
Ver4 :



Ver5 :





V4 on the right:


V4 on the left :

 

Anyone ?? Just so you know I have put in the ver 5 diff and it is way more tighter than the old one ever was