[sorner]

I put a cast rear into a 2284 but only because the aluminum was destroyed. That was a little more difficult than putting it in an 1864 because I had to also swap the reduction gear. For the 1864, swapping the pump and installing a new cork gasket should be about it.

There have been intense opinionated debates on here about this very subject, it's a matter of opinions as to which is better and why. Just like what oil to use in the rear. The cast iron is heavier than the aluminum, but I've learned that unless the rear is broken and you already have the parts, it's not really worth it to do that swap, when wheel weights and/or loading the tires will add weight just the same.