D-5 identification question?

[Darkside]

Bought a D-5 from a guy that told me the convertor came from a 86-87 turbo regal. Instead of having D then 5 stamped around the convertor it only has 5 stamped around convertor. Is this still a D-5?
Thanks

 

[WE4]

If it has never been rebuilt yes. If it has , 50/50 chance.

 

[Darkside]

Thanks