you can weld it with the diff in place but it would be a better idea to remove it just make sure you FILL those spider gears up with welds and not just a few tacs and only e30 and ti diffs will work so the 318is ones will not work. but i would spend the extra bit of money and buy a e30 lsd __________________ -Josh Sold-1995 318ti, Club Sport, Hellrot Sold-1996 318ti, Active Model, Boston Green Current- 1995 318ti, sport model, schwartz |