Thanks lads for all your input into this post well there is good news I'v had both the diff covers off tonight and to be onist I was at a bit of a Los but I'v sent a texet to a very good friend and he has told me how to work it out . To witch I'v done and both of the diffs are the same with 47 teeth on the crown,s and 13 on the pinion witch works out to 3.615 . So I'm happy now to no this is good and it's the way the ca will be . Thanks again for every ones input this is wot this site is for and it works very well thanks