Lock Ring Tool

all-years All Makes All Models Parts | MF293 | 1962-76 Mopar Lockng Ring Install Tool | Classic Industries

Notice that in the picture there is an offset in the handle. I don't believe mine came with that offset, but I'm thinking of bending it into the handle, because it would help. However, it still works.

Just edited: this might be a better choice, it clearly shows a nice offset.
Mopar 57 58 59 60 61 62 63 64 65 66 67 68 69 70 Dodge Sending Unit Wrench Tool | eBay