7-1/4" axle shaft oil seals, new and old numbers.

[timk225]

I might be pulling the axle shafts out of the 7-1/4" in my 1973 Duster. Got my longer wheel studs and wheel spacers to make the rear track look less stupid from the back, and I doubt these 3" wheel studs will slide in without pulling the axle shafts out.

I looked online, and it seems that #2643464 is the OEM part number, but it makes no sense to use a 50 year old seal and expect it to seal, so I looked on the Advance Auto Parts website, and found what seems to be the same thing.

https://shop.advanceautoparts.com/p...xle+oil+seal&selectedFulfillment=store_pickup

It specifies a 2.3" housing bore and a 1.4" axle diameter, can anyone confirm these measurements? It looks right, but there's nothing like the feeling of being halfway through the job, setting the new part in place, and realizing there's no way it'll work, it is too big or small.

While I'm at it, if it needs it, I might clean and regrease the axle bearings, the grease surely is very old, and I put 2500 miles on the car last year. I'm not going to change the bearings, just clean and relube with Mobil 1 synthetic grease, the pink stuff.

 

[Vaanth]

I might be pulling the axle shafts out of the 7-1/4" in my 1973 Duster. Got my longer wheel studs and wheel spacers to make the rear track look less stupid from the back, and I doubt these 3" wheel studs will slide in without pulling the axle shafts out.

I looked online, and it seems that #2643464 is the OEM part number, but it makes no sense to use a 50 year old seal and expect it to seal, so I looked on the Advance Auto Parts website, and found what seems to be the same thing.

Advance Auto Parts - Down for Maintenance

It specifies a 2.3" housing bore and a 1.4" axle diameter, can anyone confirm these measurements? It looks right, but there's nothing like the feeling of being halfway through the job, setting the new part in place, and realizing there's no way it'll work, it is too big or small.

While I'm at it, if it needs it, I might clean and regrease the axle bearings, the grease surely is very old, and I put 2500 miles on the car last year. I'm not going to change the bearings, just clean and relube with Mobil 1 synthetic grease, the pink stuff.

If your 1973 Duster 7-¼" axle has 10 inch brakes, the listed 8660S seal is the correct one. If your 1973 Duster 7-¼" axle has 9" brakes, it will not fit.

The linked aftermarket part number 8660S is a replacement for Chrysler part number 2852948 which is the axle seal for the 1973 - mid-1982 7-¼” axle with 10" drum brakes and the 1969 - early 1971 B-body 8-¼” axle.

Chrysler part number 2643464 is the original number for the axle seal in the 1966 - 1970 B-body 7-¼” axle.

Chrysler part number 3432691 is the original part number for a 1973 Duster with the 7-¼” axle with 9" drum brakes. 3432691 supersedes the earlier number, 2404052.

The following tables show Chrysler and aftermarket numbers for both seals:

1973 - mid-1982 7-¼” axle with 10" drum brakes and the 1969 - early 1971 B-body 8-¼” axle

Brand	Part Number	Notes
Chrysler	2852948	1973 - mid-1982 with 10” brakes
ABC	71-13992	1973 - mid-1982 with 10” brakes
BCA	NS8660S	1973 - mid-1982 with 10” brakes (NTN)
CR (Chicago Rawhide)	13992	1973 - mid-1982 with 10” brakes (part of SKF)
L&S	71-13992	1973 - mid-1982 with 10” brakes
National	8660S	1973 - mid-1982 with 10” brakes
Precision Seals & Bearings	8660S	1973 - mid-1982 with 10” brakes
PTC	PT8660S	1973 - mid-1982 with 10” brakes
Sealed Power	N-13418	1973 - mid-1982 with 10” brakes
Schaeffler	SS2468	1973 - mid-1982 with 10” brakes (formerly FAG)
SKF	13992	1973 - mid-1982 with 10” brakes
Timken	8660S	1973 - mid-1982 with 10” brakes
WJB	WS8660S	1973 - mid-1982 with 10” brakes

1963 - 1976 7-¼” axle with 9" drum brakes (until 1/1/1976)

Brand	Part Number	Notes
Chrysler	2404052	1963 - 1970, leather. Can be used on later.
Chrysler	3432691	1971 - 1972, leather or rubber, 1973 - 1976 with 9” drum brakes, rubber. Can be used on earlier.
Centric	41763016 or 417.63016	1963 - 1972, 1973 - 1976 with 9” drum brakes
CR (Chicago Rawhide)	13418	1963 - 1972, 1973 - 1976 with 9” drum brakes (part of SKF now)
L&S	71-13418	1963 - 1972, 1973 - 1976 with 9” drum brakes
National	484058	1963 - 1971
National	5124	1972, 1973 - 1976 with 9” drum brakes
Sealed Power	N-13418	1963 - 1972, 1973 - 1976 with 9” drum brakes
Schaeffler	SS2372	1963 - 1972, 1973 - 1976 with 9” drum brakes (formerly FAG)
SKF	13418	1963 - 1972, 1973 - 1976 with 9” drum brakes
Timken	5124	1963 - 1972, 1973 - 1976 with 9” drum brakes

The following tables show comparative size data between the 8660 seal and the 5124 seal:

2404052/3432691 (5124) Specifications (inch):

Outside Diameter (inch)	2.247
Inside Diameter	1.326
Thickness	0.5
Housing Bore	2.226

2852948 (8660) Specifications (inch):

Outside Diameter (inch)	2.296
Inside Diameter	1.399
Thickness	0.460
Housing Bore	2.292

NOTE: The 1960 - 1962 7-¼" axle seal was a different metal and leather seal, Chrysler part number 2070130 (National 51256).

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[timk225]

Thanks for the thorough details.

I should have mentioned that, my 1973 Duster has the 10 by 2-1/2" rear drum brakes. Power disc brakes on the front wheels.

There's a physical difference in the axle housing if it had 9" drum rear brakes? Chrysler should have kept all that the same and made the 9" backing plate fit what was already there.

 

[Vaanth]

Thanks for the thorough details.

I should have mentioned that, my 1973 Duster has the 10 by 2-1/2" rear drum brakes. Power disc brakes on the front wheels.

There's a physical difference in the axle housing if it had 9" drum rear brakes? Chrysler should have kept all that the same and made the 9" backing plate fit what was already there.

It was the other way around. The 9" brake was first on A-bodies starting in 1960, but the late sixties B-bodies had 10" brakes on their 7-¼" axle. Although still a light duty axle, it was built a little beefier for the heavier cars as a separate overall axle. It was cost effective to keep the longer running and more numerous A-body axle the same until 1973 when things were upsized to match the disk brake package and shared the 10" backing plate with the bigger cars, and used the old 8-¼" axle seals (though different than the 1973 8-¼" axle, which itself had changed over time to align it more with the "new" 9-¼" axle).

The 9" drum axle remained the same on the six cylinder, small lug pattern cars through December 31, 1975 when it was dropped. The A-body itself was dropped after 1976, and the F-body (and later J-bodies and M-bodies) took over with another 7-¼" axle with a wider track and different perches, but using the 10" brake setup. The 7-¼" axle was enhanced again in 1980 and the rear cover changed to 10 bolts from 9 bolts of earlier axles. Then as a running change in 1982, the current 8-¼" axle tubes were adapted to the 7-¼" axle center section, so it shared axle ends and hardware with the 8-¼" axle though 1989 when the rear wheel drive cars ended. There was crossover with the 7-¼" axle that was used in some Dakota trucks, but it was essentially the latter 1980s car axle with different mounting, etc.

 

[bcschief]

I believe 60-62 uses a different number.

 

[Vaanth]

I believe 60-62 uses a different number.

From my post: