From what you are telling us you have a 73 duster, and you know (For sure???) that you have a 904 trans (find all the numbers on the trans and date codes etc, Photos are great too) you are looking for a drive shaft ("one size shaft" ) and slip yoke.
What rear end do you have? 7 1/4, 8 1/4, 8 3/4, something else? (Mopar Casting Numbers - MyMopar.com - Mopar Part Numners)
As for slip yokes for a 904 (which I know almost nothing about in detail) I understand that there are different lengths (someone correct me if I'm wrong)
Is the engine and trans installed in the car now?
what engine is in the car?
What are you planning to do with the car?
PHOTOS PHOTOS PHOTOS.
