What's the diff

[nmuzz245]

So finally got the top down and changed the rams only to find the pump leaks too. While I wait for it to be delivered thought I'd work out the parts for the axle seals and bearings. Passenger (US) side seal is leaking. I assume it's just 8 3/4. 2.76 but there seems to be a s...tload of alternatives so throwing it open to those with much more experience than me. We didn't get many c bodies in OZ. So it's 66 Newport convertible 383 2 bbl with a/c. Again any help appreciated with part numbers and suppliers

 

[PH27L7]

Post in thread 'Axle bearing numbers'

May 11, 2023

I made this list up a while back since I've replaced my share of bearings. You can often get deals of of ebay for old USA stock. Your car's looking awesome BTW.

8-3/4 axle parts:
2404215 inner oil seal; alternates 2881135, CR/SKF 15460, National/Timkin 8695S, Centric 41763002
2070933 retainer foam gasket; Felpro 13800
2881314 steel retainer gasket; Felpro 55032
3621967 seal package
2525415 wheel bearing set; SKF BR7, Timken SET7

• PH27L7

 

[CBODY67]

Check the Factory Service Manual about the need (or lack thereof) to pack the rear wheel bearings with grease before installation. Just a precaution. Some use the axle's gear lube for their lube as others might not.

Enjoy!
CBODY67

 

[413]

Inner axle seals at rock auto.

Yes pack the rear bearings in grease. Since the gear oil washed the grease out they need repacked now.

 

[Fury1969WI]

General Info: 8-3/4 is not unique to C-Body - info you find in FBBO, FABO, etc. will more than likely apply.

Supplier: For ease and quality i would go to Doctor Diff (Drivetrain :: Mopar 8 3/4" ) - but I don't know if he ships outside US.

 

[Big_John]

So finally got the top down and changed the rams only to find the pump leaks too. While I wait for it to be delivered thought I'd work out the parts for the axle seals and bearings. Passenger (US) side seal is leaking. I assume it's just 8 3/4. 2.76 but there seems to be a s...tload of alternatives so throwing it open to those with much more experience than me. We didn't get many c bodies in OZ. So it's 66 Newport convertible 383 2 bbl with a/c. Again any help appreciated with part numbers and suppliers

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View attachment 750057

I think they have covered seal part numbers for you, but I think you are looking for more info on what you have.

The last 3 digits of the casting number is 742. That means it's a straight 1 3/4" pinion gear shaft. That's a good thing as it's the larger of the pinions that were available in 1966.

The next thing to figure out is if you have a "sure-grip" rear or an open rear. Jack up the rear and spin the rear tires. If the wheel on the opposite side revolves the same way, it's a sure-grip. If it rotates the opposite direction, it's an open rear (which is most likely).

To figure out the ratio, I'll make it easy on myself and just post a couple videos I found. You can also search around on YouTube for other videos that may explain it differently.

 

[CBODY67]

On the ratio, there might be a metal tag with the ratio stamped on it, on one of the bolts holding the pumpkin to the axle housing. Not big, but there.

 

[nmuzz245]

On the ratio, there might be a metal tag with the ratio stamped on it, on one of the bolts holding the pumpkin to the axle housing. Not big, but there.

Thanks. There is 2.76 on the tag. Good to know some info

 

[nmuzz245]

I think they have covered seal part numbers for you, but I think you are looking for more info on what you have.

The last 3 digits of the casting number is 742. That means it's a straight 1 3/4" pinion gear shaft. That's a good thing as it's the larger of the pinions that were available in 1966.

The next thing to figure out is if you have a "sure-grip" rear or an open rear. Jack up the rear and spin the rear tires. If the wheel on the opposite side revolves the same way, it's a sure-grip. If it rotates the opposite direction, it's an open rear (which is most likely).

To figure out the ratio, I'll make it easy on myself and just post a couple videos I found. You can also search around on YouTube for other videos that may explain it differently.

Thanks. I will check it out. Found the ratio tag