Thanks Treblig ! AND, here is the info you found :
Outside Width Year Model
56.00 1932-1934 All Mopars
55.60 1960-1976 7 1/4 A-body
55.60 1973-1976 8 1/4 A-body
55.60 1966-1972 8 3/4 A-body
55.60 All 8 3/4 A-body
58.54 All 8 1/4 F-body
58.54 All 8 1/4 M-body
58.54 All 8 1/4 J-body
59.00 1935-1936 All Mopars
59.14 1966-1970 9 3/4 B-body
59.20 1962-1970 8 3/4 B-body
60.00 1937-1948 All Mopars
60.70 All 8 3/4 E-body
60.70 All 9 3/4 E-body
62.00 All 8 1/4 B-body
62.00 1971-1974 8 3/4 B-body
62.00 All 9 1/4 B-body
63.40 All 8 1/4 C-body
63.40 1971-1974 8 3/4 B-body S.W.
63.40 All 9 1/4 C-body
Is that supposed to be track width? Because it doesn't match ANY of the actual measurements from the rear axles. Not for A-body's, not for E-body's, and definitely not B-bodies (there are more than 3 different widths for that date range).
A-body 8 3/4's are 52.625" flange to flange, and are 57.125" drum to drum. The 7.25's are supposed to be the same width as the 8 3/4's, but I found that the BBP 7.25" rear that came out of my '74 Duster was a little more than an inch narrower, about 51.5" flange to flange and about 56" drum to drum. Enough to throw off my measurements for my rear rims, but I'm maxed out on tire with a 295.
Here are some better numbers, these are flange to flange measurements...
Housing widths, flange to flange
A BODY
'66-'72= 52 5/8"
B BODY
'62-'63= 53 1/4" (And '64 Max Wedge)
'64 = 55 5/8" (Exc. Max Wedge)
'65-'67= 54 1/4"
'68-'70= 54 15/16"
'71-'74= 57 7/8"
'71-'73 wagon= 59 7/16"
C BODY
'65-'69= 56 3/4"
'70-'71= 57 7/8" (Chrysler & Fury)
'70-'74= 59 7/16" (and '69 wagon)
IMPERIAL
'65-'66= 57"
'67-'69= 57 3/8"
'70-'71= 54 3/4"
'72-'73= 59 5/8"
E BODY
'70-'74= 56 31/64"
A100
'65-'70= 56 3/4"
D100
'65-'71= 58 5/16"
'72-'74= 59 7/16"
F BODY
76-80= 54.34 (8 1/4 axle!)
Rear end widths, drum-to-drum:
A BODY
'66-'72= 57 1/8"
B BODY
'62-'63= 58 1/2" (And '64 Max Wedge)
'64 = 60 7/8" (Exc.Max Wedge)
'65-'67= 59 1/2"
'68-'70= 60 1/8"
'71-'74= 63"
'71-'73 wagon= 64 3/8"
C BODY
'65-'69= 61.75"
'70-'71= 63.0" (Chrysler & Fury)
'70-'73= 64 3/8" (and '69 wagon)
IMPERIAL
'65-'66= 61 15/16"
'67-'69= 62 5/16"
'70-'71= 59 3/4"
'72-'73= 64 9/16"
E BODY
'70-'74= 61 5/8"
A100
'65-'70= 61 3/4"
D100
'65-'71= 63 15/16"
'72-'74= 64 3/8"