1969 C10 Front Wheel Seal Not Flush

[NolanAM22]

I have a 6 lug '69 C10 with 4 wheel drums that I am currently repacking the front wheel bearings on.

I did not remove the races and I am reusing the bearings. The races looked to be seated properly in the hub. I had no previous problems with the bearings, just doing this for maintenance.

I am at the point where I am putting the new front wheel seal back in after putting the inner bearing back in and the seal (National Bearing Part# 9015S) is not sitting flush with the hub surface. The top surface of the seal is about 0.160" (~5/32") above the wheel hub surface, as measured by calipers.

I drove the seal in with a seal driver and noticed that the pitch of the noise changed as I was hitting the seal, indicating that the seal was seated properly onto the top of the bearing race surface.

I have seen on these forums that the seal does not sit flush with the hub surface, but my question is: How much higher does the seal sit? 5/32" seems like a lot higher than it should be.

The previous seal that I used was National Bearing Part# 8871 and it sits flush with the hub surface. Problem is, I think I was given this by mistake last time I did the bearings. I just assumed it was a different or more modern style seal. Turns out according to Rock Auto parts catalog, it was meant for a 71-86 C10, NOT a 69 C10.

My hub casting number looks to be 3883 31030, but it is hard to tell. The number I am referring to is on the inside diameter of the hub casting.

Important measurements:
Spindle shaft - inner bearing mating surface to hub backing plate: 0.465"
9015S Seal thickness: 0.505"
8871 Seal thickness: 0.260"
9015S top surface to wheel hub surface: 0.160"

*Note* in the picture the calipers read 0.460" on the spindle depth measurement. I probably didn't have the calipers straight/parallel to the spindle longitudinal axis.