I think there is a fitting or cog or something that goes into the transfer box isn't there? It would have been on your old one if you had the OD unit fitted.I am about to fit a reconditioned gearbox and transfer box to my Series 3 but I am told that I cannot just slot the overdrive into the new unit and something has to be done before it can be fitted (not just a gasket). Can anyone enlighten me as to what this is please?
If your local to me Iām happy to have a drive out and help/advice?
Rich - NG9