Steve, All I can tell you is that my freind is running a B body rear in his 73 Duster 340. It is not narrowed and he's not using any special offset wheels and has no problems with tire clearance even with big tires. Read this below and the second chart showing the actual flange to flange measurements and not just the track and it might explain why.
Dan Section 3: Part Numbers and Demensions of Axles and Housings.The following chart can be found in the Mopar Performance Chassis Manual. the distance between spring perches is an accurate reference, however the Track listing is the source of a lot of misconceptions. Track is the distance between the two tires, and includes a proportion of the actual tire track, or patch where it contacts the ground. The chart below tends to lead people to believe that all 62-70 B-body 8-3/4 rearends are the same width, not true!
Body line Track Perches Notes A-body, 65-72 55.6 43.0 4" lug bolt circle B-body, 62-70 59.2 44.0 B-body, 71-72 62.0 47.3 B-body station wagon, 71-72 63.4 47.3 C-body, 64-72 63.4 47.3 D-body, 64-72 63.4 47.3 E-body, 70-74 60.7 46.0 Axle Housing and Axle demensionsThe following is a listing of flange to flange widths for various year 8-3/4" housings. This is a measure of the bare housing, with brake backing plates removed, from the outside of the flange across to the outside of the other flange. Chrysler part numbers are listed as well for the purpose of showing a distinction between some housings and axles.
Part# Application Flange to Flange Width Notes 1045744 1945745 2070259 2070269 2070270 207096057-62 fullsize 63-64 Chrysler/880 55-5/8" (est.) 8-1/4" axles 57-61 have different housing part numbers.
SG axle shorter than open rear axle, except for 1964 models. 65 C-body unknown axle 2404228 same as A-100 vans and trucks. 2800175 66 C-body unknown 2881003 69 C-body 56-7/16" 2881310 69 C-body wagon 59-7/64" 70 C-body 57-3/4"2070231 60-62 Imperial unknown Imperials: 57-63 SG, all 64 axle 1829267
2070961 63-64 Imperial unknown Imperials: 57-63 open axle 1675449 2404208 65-66 Imperial unknown different from above axles, 2404139 2800224 69 Imperial unknown 2070539 62-63 B-body64 Max Wedge 53-1/4" a.. Parts Manuals list four different axles for this housing:
b.. 2070573 - 741 case w/o SG 30-1/2" overall; c.. 2404003 - 742 case w/o SG 30-1/2" overall; d.. 2070695 - 741 case SG 30-7/16" overall; e.. 2404050 - 742 case SG 30-7/16" overall;2404271 64 B-body except Max Wedge. 55-5/8" (est) 1/8" - 1/4" narrower than 2070270 (fullsize Chrysler) housing. axle length 31-1/2" overall.
2404143 65 B-body 54-1/2" uses axle 2404223 2643409 66-67 B-body 54-1/4" 2852838 68-69 B-body 54-15/16" same as 1970 B-body, 1/32" difference 3432295 70 B-body 54-29/32" same as 1968-69 B-body, 1/32" difference 3507502 71-73 B-body 57-47/64" 3507501 71-73 C-body 71-73 B-body SW 59-1/8" 2800227 3432647 343229566-72 A-body 52-13/64" (70-71) 52-37/64" (72) 4" bolt circle, used 10x1-3/4" drums. These demensions come from 1970,71,72 Factory Parts Manuals
2852882 70-74 E-body 56-7/16"----- Original Message ----- From: "Steve Chervinsky" <63hemipolara@xxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx> Sent: Saturday, August 09, 2008 7:08 AM Subject: Re: green bearing questions
Here is the dims of the 8 3/4 axles, yes the spring perches only have to be moved an inch inwards, but overall the diff is 4" wider: Because the 8-3/4" axle was available in most body lines, there are a variety of housings available. Following are some of the passenger car axle dimensions and notations. <br> The Perches dimension is the distance center to center between the spring mount perches. Body Line Track Perches Notes Dimensions are in inches. A-body, 65-72 55.6 43.0 B-body, 62-70 59.2 44.0 B-body, 71-72 62.0 47.3 B-body, 71-72 63.4 47.3 station wagon C-body, 64-72 63.4 47.3 D-body, 64-72 63.4 47.3 E-body, 70-74 60.7 46.0 Dodge, Chrysler, Plymouth Rear Axle Dimensions Rear Axle dimensions and diagram for Chrysler, Plymouth, and Dodge cars. Rear Axle's. covers A-Body, B-Body, C-Body, E-Body and F-Body. Year Axle (A) (B) (C) 1963 - 1972 7 1/4" A-Body 53.200" 43.02" 10.09" 1973 - 1976 7 1/4" A-Body 51.400" 43.02" 10.09" 1973 - 1976 8 1/4" A-Body 51.400" 43.02" 11.69" All 8 1/4" B-Body 57.800" 47.30" 11.69" All 8 1/4" C-Body 59.200" 47.30" 11.69" All 8 1/4" F-Body 54.340" 44.46" 11.69" All 8 3/4" A-Body 51.400" 43.00" 12.35" 1962 - 1970 8 3/4" B-Body 55.000" 44.00" 12.35" 1971 -1974 8 3/4" B-Body 57.800" 47.30" 12.35" All 8 3/4" E-Body 56.500" 46.00" 12.35" 1971 -1974 8 3/4" B-Body S.W. 59.200" 47.30" 12.35" All 9 1/4" B-Body 57.800" 47.30" 11.69" All 9 1/4" C-Body 59.200" 47.30" 11.69" 1966 - 1970 9 1/4" B-Body 54.936" 44.00" 13.47" All 9 1/4" E-Body 56.500" 46.30" 13.47" (A) = Flange to flange. (B) = Leaf spring centerline to leaf spring centerline.. (C) = Centerline of axle shaft to centerline of rear universal joint. Illustration & Information from Chrysler Performance Upgrades, by Frank Adkins. Published by CarTech as part of their SA Design series. Check the following link as well: http://www.mymopar.com/axledims.htm It is not a direct bolt in and offset wheels would have to be used if the axles are not narrowed as evident in all articles of the dims of the 8 3/4 A and B body.
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