I'v just bought a 1991 range rover for off roading, lots of fun but it has no diff lock, it's been converted from a petrol V8 auto to a 200 TDI manual. I'v looked at diff lock kits but are really expensive, i also looked at fitting a disco tranfer box but i don,t know alot about land rovers and if its compatable. Can anyone help point me in the right direction cheers.