1941 Rear-end Compatibility Notes:
Wheelbase 117in
Front Tread 57in
Rear Tread 60.125in
Ratio 3.9:1
Possible replacements:
1939-48 Plymouth, DeSoto, Dodge?, Chrysler
1987-90 Dodge Dakota Track Width: 60.8″/ Ratio: 3.55:1 (1250rwd) / Ratio: 3.9:1 (1800rwd)
Other references:
http://www.carnut.com/specs/rear.html