I'll probably be lucky if it will interchange with either pre '85 or post '85. Early versions('70s) were David Brown Mine is an '85 model if I remember correctly. Im on a ship in Brazil at the moment and don't have serial# with me. It was UK built and has a bigger pump (17gpm) and front end than the ag 485. Not sure if that would make a difference with the porting size of remote manifold that mounts on right side of trans housing. I got a quote for rebuilt remote of $1,300. Sure can't go that route. There was a whole parts IH485 on EBAY that went for $600!
Thanks for info,
Mac