Hi
You need a 75w-90 for the gearbox and diff.
http://www.opieoils.co.uk/c-673-75w-...ion-fluid.aspx
If you want to go for the best, the Millers CRX 75w-90 NT, Gulf Competition, Motul Gear 300, Red Line 75w-90NS and Millers TRX are ideal for the gearbox. The Castrol Universal/Universal Plus, Motul Motylgear and Fuchs Gear Syn are all decent alternatives. The Fuchs Syn 5, Millers CRX, Redline 75w-90 GL5, Motul Gear 300 and Gulf Competition are ideal for the diff. The Fuchs Sintopoid, Castrol Syntrax Longlife, Millers TRX, Motul Motylgear, Mobil SHC and Amsoil FGR are also good choices.
Cheers
Tim