Outer Limits 4x4 Board

My mate has a 8/05 turbo diesel hilux and want a front locker arb said theres 2 different type depending on what diff ratio he has how do we know what ratio he has in the diffs?

Cheers

http://rsmotorsport.com.au/files/Identi ... _Hilux.pdf" onclick="window.open(this.href);return false;

cheers mate I rang toyota and gave them the vin number and they told me which one it is