My 6BT came with a SAE2 housing that had a ZF6 attached. It is from a Leyland Daf 55 210TI. They are pretty big and thats why I didn't get the ZF6 as the hole enchilada would not fit the tunnel without a fair bit of lift.Anyone know if the 4BT or 6BT has SAE #2 flywheel housing available? I've seen SAE housings but not sure if #3 or #2 or ...? IIRC, the SAE housing I saw was on a 6BT from a Freightliner, likely a #2 but I don't know for sure.