47-55.1 Axle Seal / Wheel Bearings

[Darthintel]

I bought a 1954 Chev 3100 truck and started working on the rear brakes.
After removal of the drums I could see that it had leaking axle seals.
I ordered all new brake hardware (brake shoes, springs, wheel cylinders, master cylinder, rear axle bearings and grease seals).

I removed the brake hardware and pulled the axle. I then pulled the oil seal and compared to the new one...something is wrong. The bearings and axle seals I bought are too small.
I'm thinking I have a 1 ton axle under my truck based on the fact that I can count 10 leaf springs.

I took the following measurements:
Axle tube opening:
70.33mm / 2.76"

Old oil seal:
70.39mm / 2.77"

New oil seal:
61.3mm / 2.41"
Part number National 450666

New bearing:
61.25mm / 2.4mm
Part number National R1500EL

Since the parts I ordered for a 1/2 ton truck are too small, I'm thinking I have a heavier duty axle under the truck but need help identifying.
The 10 leafs in the springs are a clue. Is this a 1 ton axle?
It does have the enclosed drive line.

Thanks in advance for help.

[Darthintel]

I looked up a 1955 chev 3100 truck, and the National wheel bearing is RW507ER.
Outer diameter 2.8346". May fit my axle tube of 2.767". (press fit)
This may be the one ....

The vehicle ID indicates H54 ........so not a 1955. Who knows.

Any thoughts?

[Darthintel]

Below are pictures if the "National" oil seal I pulled.
I haven't found any oil seal with an OD of ~2.8".
All the oil seals for 1954 and 1955 trucks are 2.41" that I have found.

[Darthintel]

After doing a lot of research, I've been able to come to the conclusion that there's 2 different sizes of axle bearings and seals for these trucks from many suppliers.

One size is 2.41" OD. The other size is 2.78" OD.

I just happened to purchase the 2.41" OD parts before I had the axle and seal pulled. My axle tube requires the 2.78" OD parts.

This made thing very frustrating, but - it's not a required daily driver and it can sit and wait for parts.
I can find many other things to work on

Hopefully this will help others in the future.

[MiraclePieCo]

Thanks for following up. You had a 50/50 chance of getting the right ones, funny how that seldom works out.