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E-body axle housing

Gísli Sveinsson

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I have found 8 3/4 axle housing for 70-74 E-body,seller told me that it measures 56-11/16" from flange to flange on the outside. The spring perches are 46" center to center.
So my question is might this be axle housing from C BODY ’65-’69: 56 3/4″
Thanks
 

gzig5

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This is the best chart that I have found. It suggests your suspicion of C-body may be correct. E-body is less 56 31/64". He's got 3/16" measuring error if it is an E-body, or is measuring to a different point. Having said that, I doubt you could tell the difference between the two installed on the car?

Mopar Rear Axle Dimensions
 

Gísli Sveinsson

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Ok,but what about axle bearing adjuster on the right side and E-body axle in C-body housing,no trouble there to adjust endplay,I would rather not use green bearings.
Thanks
 

340challconvert

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This may also help.
A lot of information, but thorough;

Chrysler 8-3/4" Rear Axle Guide

Rear Axle Guide

The diagram below illustrates 8-3/4" axles. The axle "A" is a 66-72 A-body axle. and the other two are longer axles that generally resemble the B and C body and truck axles. C body and truck axles can be shortened and re-splined by a quality machine shop, however it is important to note that not all C-body/Truck axles are created equally.

The top axle shows that at the location of where the new splines will be (26" from bearing retaining plate to the end of the axle, see measurement #2 in the diagram) the outside diameter (OD) must be larger than what the OD of the spline needs to be.

The bottom axle illustrates how many mid-60's axles taper as they near the splines, these can not be used as A-body short axle donors!



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The Chrysler 8-3/4" rear axle assembly was introduced in 1957. It is a banjo-type ( Hotchkiss ) axle, ie. the differential is contained in a removable carrier assembly. The axle has an 8-3/4" diameter ring gear. There are three basic types available distinguished by their drive pinion stem diameter. The 8-3/4" axle was the primary axle assembly used in most car lines through 1972.

8-3/4" Axle Center Section Types

The 8-3/4" axle was available in three basic types. The types are differentiated by the pinion stem diameter....1-3/8", 1-3/4", 1-7/8". The choice of axle pinion assembly was determined based on the application.

1-3/8" small stem pinion (aka. '741')>
Carrier casting numbers: 1820657 (1957-1964), 2070741 (1964-1972). This assembly was typically used in low weight/low horsepower applications through low weight/medium horsepower and high weight/low horsepower applications. Pinion depth and bearing preload is set with shims. Differential bearing setting (ie. backlash ) is set with threaded adjusters.

1-3/4" large stem pinion (aka. '742')
Carrier casting numbers: 1634985 (1957-1964), 2070742 (~1961-1969). This assembly was replaced by a phase-in of the 1-7/8" pinion starting in the 1969 model year. 1970 RW (Plymouth and Dodge mid-size) were the last models to use the 1-3/4" which appeared in a 2881489 case. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications. Pinion depth and bearing preload is set with shims. Differential bearing setting (ie. backlash ) is set with threaded adjusters.

1-7/8" tapered stem pinion (aka. '489')
Carrier casting numbers: 2881488, 2881489 (1969-1974). This assembly was introduced in 1969 and was phased-in to replace the 1-3/4" unit through 1970. Note: the 1-3/4" pinion also appeared in some '489' carriers during this period. By 1973, the '489' was the only unit available in passenger car applications. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications. Pinion depth is set with shims, preload is set with a crush sleeve. Differential bearing setting (ie. backlash ) is set with threaded adjusters.

All 8-3/4" carrier assemblies can be identified externally by the casting numbers. Additionally, the '741' commonly has a large X cast on the left side, the '742' may have a large 2 cast on the left side, and the '489' has a large 9 cast on the left side. Through 1965, the factory ratio was stamped on the identification boss, followed by an 'S' if Sure Grip equipped. After 1965, a tag was affixed under one of the carrier mounting nuts to identify the ratio. If Sure Grip equipped, an additional Sure Grip lube tag was sometimes affixed; later years sometimes had the filler plug painted orange.

Gear ratios available on the 8-3/4" axle through the years include: 2.76, 2.93, 3.23, 3.31, 3.55, 3.73, 3.91, 4.10, 4.56, 4.89, 5.17, 5.57. On OEM gear sets, the ratio is usually stamped on the ring gear edge. Ratio may be determined by the number of teeth on the ring gear divided by the number of teeth on the pinion gear or by counting the ratio of the number of turns of the pinion relative to one turn of the axle shaft.

The 8-3/4" center section is removed from the front of the housing. It is retained by 10 nuts on studs in the housing. The rear of the housing is smooth, the back is welded onto the main housing. The axle tubes are part of the overall housing. To remove the center section, remove the wheels, brake drums, and drive shaft (note: pre-65 units have a pressed-on brake hub requires a puller for removal). Remove the axle shafts, 5 bolts on the backing plate flange on post 64 units, use puller for pressed-in pre-65 units. Remove the 10 nuts on the housing studs around the carrier perimeter. Remove the carrier may require prying, fluid will drain when carrier gasket seal is broken.

Continued below:
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Last edited:

340challconvert

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(continued)
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. The 'Perches' dimension is the distance center to center between the spring mount perches. Dimensions are in inches.

Body line Track Perches Notes:

A-body, 65-72 55.6 43.0 4" lug bolt circle, offered in heavy duty apps.
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

The 8-3/4 was also available in the 58-74 D100/W100 trucks (and variants), the 64-70 A-100 trucks and vans, the 67-70 A-108 trucks and vans, the 71-74 B100/B200 vans and non-listed 57-64 full and mid-size car models.
Note: the axle centerline to yoke/universal centerline is 12.35" for the 8-3/4" axle.


Interchange Notes:

Any 8-3/4" center section may be interchanged for another as an entire assembly except for a thrust block difference of non-Suregrip units built before 1964 (See Part II, Section 1).

All 8-3/4" axle shafts, 65-74, are retained by a bolt-on flange. Axles can be interchanged within housings of the same width. The passenger side axle has a threaded adjuster to set axle shaft end play.

Note: there was a slight dimensional change in axle shaft length when the Sure Grip design changed. If interchanging axles with the slight difference, the threaded end play adjustment can be used to accommodate it.

Note: the 57-64 8-3/4 axle driveshafts were tapered and used a keyway and locknut to retain the brake assemblies and end play was set with shims. The 65 and later units use flanged axle shafts and a threaded adjuster to set axle end play.


Gaskets, Seals:
Position Chrysler National C/R Fel-Pro
--------------- -------- -------- -------- --------
Axle inner seal 4796698 8695S 15460 ---
Axle outer seal 2404216 8704S 19000 ---
Axle flange, foam 2070933 see flange kit see flange kit 55032
Axle flange, shim 2881314 see flange kit see flange kit ---
Carrier gasket 1673367 --- --- RDS 65833
Pinion seal, 1-7/8 2931862 5126 18708 ---
Pinion seal, 1-3/4 2931862 7216 18912 ---
Pinion seal, 1-3/8 2931862 8515N 18708 ---
Yoke repair sleeve --- 99187 99187 ---

Bearings:
Position Cup/Cone, Timken, BCA Notes:
------------- --------------------- ------------------
Differential, side LM 104949/LM 104912 70-74, Borg Warner
Differential, side 25590/25520 57-69, Dana
Pinion, front M88048/M88010 1-7/8"
Pinion, front HM89443/HM89410 1-3/4"
Pinion, front M88048/M88010 1-3/8"
Pinion, rear M804049/M804010 1-7/8"
Pinion, rear M803149/M803110 1-3/4"
Pinion, rear HM89446/HM89410 1-3/8"

Axle, outer BCA A-7 65-74
Axle, outer C/R BR7 65-74

Axle bearing service kit: Chrysler # 3683966, one axle.
BCA differential kit: 1-7/8", # RA-301, 1-3/4", # RA-300.
BCA axle mounting flange repair kit: Left # A-7-LK, Right # A-7-RK.
C/R axle mounting flange repair kit: Left # A7-LK, Right # A7-RK.

Note: the 8-3/4" axle shaft outer bearings require packing with grease as they are not lubricated by the gear oil.

Miscellaneous:
Vent bolt - Chrysler # 4032798
Spring mounting pads (perches) - Chrysler # P4120074
'489' collapsible spacer (pinion bearing preload) - Chrysler # 2931687
Mopar gear lubricant - 4318058
Mopar Sure Grip axle additive - 4318060
Mopar wheel bearing lubricant - 4318064



Body line Track Perches Notes

A-body, 65-72 55.6 43.0 4" lug bolt circle, offered in heavy duty apps.
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

Axle Housing PN Application Housing Width/Axle Information
1045744 57-61 8-1/4" same width as 57-62 fullsize V8
2070269 and 63-64 Chrylser/880 flange to flange: 55-5/8" (est.)

Note 8-1/4" axles 57-61 have different housing part numbers.

1945745 57-62 fullsize V8 same width as 63-64 Chrylser and 880 2070270 SG axle shorter than open rear axle flange to flange: 55-5/8" (est.)

2070960 63-64 Chrysler same width as all 61-62 rear ends listed 63-64 880 above ( 2070259 / 2070270 )
SG axle shorter than open rear axle (63)
SG axle and open axle same length (64)
flange to flange: 55-5/8" (est.)

NA 65 C-body axle 2404228, same housing and axles as A-100 vans and trucks.

2800175 66 C-body unknown

2881003 69 C-body flange to flange: 56-7/16"

2881310 69 C-body wagon flange to flange: 59-7/64"

NA 70 C-body flange to flange: 57-3/4"

2070231 60-62 Imperial Imperials: 57-63 SG, all 64 axle 1829267

2070961 63-64 Imperial Imperials: 57-63 open axle 1675449

2404208 65-66 Imperial different from above axles, 2404139

2800224 69 Imperial

2070539 62-63 B-body, flange to flange: 53-1/4"
64 Max Wedge Parts Manuals list four different axles for this housing:
2070573 741 case w/o SG 30-1/2" overall
2404003 742 case w/o SG 30-1/2" overall
2070695 741 case SG 30-7/16" overall
2404050 742 case SG 30-7/16" overall

2404271 64 B-body flange to flange: 55-5/8" (Hollander est) except 1/8" - 1/4" narrower than 2070270 housing Max Wedge axle 31-1/2" overall

2404143 65 B-body flange to flange: 54-1/2" uses axle 2404223

2643409 66 B-body flange to flange: unknown, thought to be narrower than 68-70 B-body

2852838 68-69 B-body flange to flange: 54-15/16"

3432295 70 B-body flange to flange: 54-29/32"

3507502 71-73 B-body flange to flange: 57-47/64"

3507501 71-73 C-body flange to flange: 59-1/8" 71-73 B-body SW

2800227 66-72 A-body flange to flange: 52-13/64" (70-71) 3432647 52-37/64" (72) 3432295

2852882 70-74 E-body flange to flange: 56-7/16"
 
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