Recently I bought a EF transmission as my EB2 transmission was going to cost to much to repair.

The EF transmission works fine.

The only thing that I can’t get working is 1 st 2 nd and 3 rd.
Do I need a new computer to get the gears working?
Is there anyway to get them working ?

mate how can a transmission work fine but "can't get 1st 2nd 3rd" what fourth and reverse.......... service the box maybe but i think the box is f**k as the btr is interchangle from ea to au (change bellhousing) so i think that ya gb is rooted