I try to answer to all in this post.
there is two reason we decided to use this differential:
the first, my mechanich made (not finish yet) his gtv6 3.0 biturbos with 6 gearbox and 6 diff. he bought a couple of diff, one 11.50 (sell to me) and one automatic use on his gtv. I pay it not much..
the second, in this diff there is a big lsd, and if I wanna use bmw diff I must search a M differential or the diesel have lsd? anyway the hypoid crown for this car are expensive...
For the tyre, I unknown the size, for the street (but I use rarely) 205/45 16, for track if stay in evo fender 17 205/40 or similar...
I buy one of your 13/47 if you sell
Ah, I forgot.. We have external brake, in this mode we put in centre the diff..
Very very thanks to all for the help
![Smile :)](./images/smilies/icon_smile.gif)
:)