Joe,
I guess I wasn't very clear in my last post. The "heavy duty" bellhousing I'm referring to is the old cast iron type that has the crossmember mount points cast into it.
The opening of the old factory 3 speed bellhousing is too small to accomodate the larger input shaft bearing housing.
I didn't mean to imply that you had to use the aluminum bellhousing. But you WILL have to use the factory aluminum bellhousing if you have the NP tranny that has the Mopar-like casting.
-magic mike-
