Joe -
You can use the Timkin numbers and do a search at
www.Rockauto.com. It will show what vehicle the parts will fit over multiple brands.
For example - the LM603049 fits 1957-64 Full-size Chevrolet and some late model Fords.
The last number is a pinion seal -
CHRYSLERPROWLER2001-2002DODGEDAKOTA1997-1999DODGERAM 2500 PICKUP1997-2003JEEPCHEROKEE2000-2001PLYMOUTHPROWLER1997-2000
Good hunting!