Mopar alloy 8 3/4 idenity ?

[George]

I have an alloy Mopar 8 3/4" housing. I expect is quite old. It broke and was replaced by an iron unit several years ago. It is stamped above the fill plug 61400 and 4661/ 2380. The 2380 may be 2390 as the stamp isn't quite complete. I would appreciate any information. Thank you. George

[dreracecar]

Pictures would help a lot
 Mickey Thompson made a mag one  and Donovan made an aluminum version
Numbers are not much help

[George]

I will try and get a picture posted . Thank you. Bruce