I'm looking to swap out my w58 for a stronger bmw box for my 1jz Datsun 240z. I'd like to use the 6 speed because of my diff ratio (5 speeds have a 1:1 5th). I know I can use the e46 m3 6 speed (getrag 420G), and the e46 330d 5 speed but does anyone know if there was any reason I couldn't use the e46 330d 6 speed (gs6-53dz)? The gs6-53dz six speed is a bit cheaper, potentially stronger and easier to come by. This would have to be with the pmc kit (or similar), which doesn't come with a clutch. I know the spline count is different, but I'd just use a clutch to suit. The only thing I can think of that could be different is the length of the input shaft, anyone know if they are different?? I also know they changed over to have a pilot bearing in the input shaft rather than the flywheel at some point on the GS6-53DZ, but it easy enough to check I'd got one of the earlier ones where the pilot bearing would be in the flywheel via the pictures. e.g.