Differential Leak?

[dodgedart1968]

I inspected the underside of my '68 Dart for the first time today. The floor is very oily over a large area above the differential . What causes this, and what is needed to correct it?

[

 

[MOPARMAGA]

Without seeing it my guess is a very worn pinion seal

 

[dodgedart1968]

Is that the seal at the front of the diff?

 

[MOPARMAGA]

Is that the seal at the front of the diff?

Yes behind the yoke.

 

[royslead]

Yep, my guess, too!