bellhousings are part of the tranny and are not removeable. As an alternative(but not an easy to find one) you could find the 87-88 mazda B2600 tranny/transfer case combo - it has a removeable bell housing - then get a narrow bell housing from www.hotrodcoffeeshop.com to bolt up to the tranny. Look on that site for other info on the 4g63 swaps - there may be info on oil pan interchanges as well.