Originally Posted by Moparite
I seen an article somewhere about this. The diameter of the drums are larger and won't fit in a 46. Some of the other parts you can use. You can build a bullet proof 46 if you got the $.
https://transmissioncenter.net/product-category/dodge/


All front and rear clutch drums are the same diameter - regardless if 727/46/47/48.
What you may have heard is the L/R drum differs in diameter between these units. That would be true.

The “barrel” - the main case is the same between these units in regards to diameter.