Mopar Body Codes

Not being a "Mopar Guy" , I'm needing help with body codes and rear ends I.D."s

1. 8 1/4 all F-body
2, 8 1/4 all M-body
3. 8 1/4 all J-body
What I'm looking for is a rear end assembly that will fit under my 1951 Plymouth with a gear ratio of 3:55 to 1 I've been told that they are all 58.54 outside drum to drum.
Need the emergency brake set up because I'm installing a T-5 transmission and the stock rear end has no emergency brakes in the drums!

Thank You
Marv Norton
[email protected]

 

A list of rear axle widths for Mopar, FoMoCo, and GM...

http://www.carnut.com/specs/rear.html

 

[FONT=arial,helvetica,sans-serif][FONT=arial,helvetica,sans-serif]f body - aspen, volare, road runner, r/t ('76-'80)
j body - mirada, cordoba ('80-'83)
m body - diplomat, lebaron, gran fury, fifth avenue ('77-'88)[/FONT][/FONT]