Tracking woes

Can't get my head round this
The vehicle in question is my series 2a 88" I put a new trackrod end on for the mot,no probs there it went straight through,but I'm confussed at what to set the tracking to? As said it's a series 2a 88" but it's got disco 300tdi axles on it so do i set it for a 2a or a disco? (it's set parallel at the moment)

any ideas welcome

cheers

is it 4x4 or 2x4 like series ,usualy vehicle when driven on road in rear wheel drive like series vehicles are toe in as rear wheels push front outwards as wheel as forwards, front wheel drive are toe out as drive thru wheels pulls wheels in equal 4x4 like disco def rr are parallel, if you have series drive set as series toe in

Yeh still series box so only 2wd on road,that was my initial thought to set it to what a series should be but confused myself thinking about it too much! Cheers James