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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old March 6th, 2020, 03:55 PM
stevecamper stevecamper is offline
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Default Info on rear wheel bearings

Hi all! New to this forum. I have a 66 gmc that I have dragged around with me for almost 30 years now and I have started to rebuild it. Long story short, driver side rear wheel bearing and axle look fine and I can replace them np. The passenger side, however, the bearing is badly pitted and the axle is also pitted. Its a HA - 3.73 12 bolt rear end. Here are my q's:

1) do I buff the axle and try and smooth the surface? If so, what is the best way? What to watch out for?
2) I see there are "repair bearings" which incorporate a seal and are suppose to shift the bearing to ride on a newer surface of the axle. Do these actually work?
3) do I run a normal bearing on the pitted axle?
4) do I run a normal replacement on one side and the repair kit on the other or should I keep them matched?
5) bearing brand of choice? Who is the best? Part numbers?

Rockauto only has Centric bearings. The current bearings are Hyatt which where made in Canada.

Thanks in advanced!
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  #2  
Old March 6th, 2020, 07:49 PM
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AZKen AZKen is offline
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Default Re: Info on rear wheel bearings

First, what is an "HA" 3.73 12 bolt? Can you state year of diff and what vehicle it came from? Second, can you post pics of the pitted area in question?
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  #3  
Old March 6th, 2020, 08:14 PM
stevecamper stevecamper is offline
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Default Re: Info on rear wheel bearings

HA is stamped on the rear end indicating its a 3.73 gear ratio (i also verified this on the stamp on the crown gear). Its the original, as far as I can tell, from 1966. I don't think my uncle changed it out to something else. There are 12 bolts in the dif cover (not 10). 8.875 inch ring gear without posi.

Bearing dimensions are:
2.531 OD
1.622 ID
0.832 W

Seal:
2.591 OD
1.62 ID
0.5 W

I have been using this to source parts:
https://www.lmctruck.com/1960-66-che...ferential-1-2t

The original truck is a 1966 GMC C1000. My uncle chopped and shortened the frame and put on a GMC 1960's hood and step side box before he gave it to me back in 85'.

I don't have pics handy but will later tonight when I get home and post them up. Thanks for responding!
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Old March 6th, 2020, 08:27 PM
lizziemeister'sV6 lizziemeister'sV6 is offline
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Default Re: Info on rear wheel bearings

The axle he is describting sounds to me like a Chevrolet full size passenger car from the mid to later 1960's. Most were open rear-ends unless they it ordered along with a high performance engine which then would be positraction/limited slip versions. 12 bolt posi could be ordered in full-size , mid-size and compact cars with higher horsepower engines. The GMC rear-ends are unlike the Chevrolet versions in the way the axles are secured.
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Old March 6th, 2020, 10:11 PM
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Default Re: Info on rear wheel bearings

I was confused also, I thought it would have a Dana 44, like my original 1960 GMC and many GMC's. Does not really matter. If it's Canadian, could have used different diff than USA? (Canadian bearings found and he lives in Canada) "C" 1000.
Steve: It depends on how pitted the shaft is. You could actually ruin the fit by sanding on it, until you reconnoiter the situation. Move cautiously. I don't know anything about repair bearings except it sounds like something I would not want to do.
Don't worry about brand of bearings, even the biggest names are made in China. Just buy a bearing from an auto parts place.

Pitting does not automatically mean it can't be reused. However, at $130, it's better to buy new than to spend anything on them or special bearings. Check around for pricing. Be sure you know your dimensions and spline count

Last edited by AZKen; March 6th, 2020 at 11:01 PM.
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Old March 7th, 2020, 04:09 AM
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Default Re: Info on rear wheel bearings

Here are the pics. I would not be surprised if my uncle swapped the diff’s between this truck and his chevelle. I will have to ask him next time I see him! The shaft is pretty pitted. I guess I might have to source an axle then or can I get it resurfaced? I might ask around and see as where I work, the mechanics once told me we send bearing housings and shafts out to be spray coated...
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Old March 7th, 2020, 02:54 PM
stevecamper stevecamper is offline
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Default Re: Info on rear wheel bearings

Here is a pic of the good axle... The VIN is 6C91534818957A which tells me is was a C1000 and an 8 cylinder. There are a couple more numbers: FT069302 PAINT 5306. The HA stamp on the rear end does line up with the documentation for the VIN to be correct as well from what I can tell. Thanks for your help!
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  #8  
Old March 7th, 2020, 08:09 PM
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Default Re: Info on rear wheel bearings

Hard to tell if the axles are still within spec for OD. Could be worn such that the fit is too loose. The method of fix or replace is up to you. You will spend to get it spray welded and remachined, so see what that cost compared to a new axle and decide of it's worth it.
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Old March 8th, 2020, 12:35 AM
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Default Re: Info on rear wheel bearings

could I interject a different solution here? in the aftermarket auto parts world there is a part known as a repair bearing. basically, it is a extended wheel bearing/seal asm. which repositions both the seal and the bearing further out on the axle shaft and is a self contained unit. I hope I have been of some assistance in this matter. BTW, welcome to the 6066 GMC truck group!

cordially,

Lewis Ellis Matkin, Jr.
Ridge Manor, Fla.
1965 1002 305E-V6(soon to be 401M)
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Last edited by LEWISMATKIN; March 9th, 2020 at 12:58 AM. Reason: welcome addition
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  #10  
Old March 8th, 2020, 06:46 PM
stevecamper stevecamper is offline
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Default Re: Info on rear wheel bearings

Thanks for the help folks!

To buy an axle from the states at $130USD will cost me a bazillion dollars canadian! On the other hand, I should be able to source one up here. I just am trying to keep costs at bay to get her on the road this spring.

I am also considering the repair bearing and was just wondering if anyone has tried one and if it works. With the shape of my axle, I would be concerned over if the damage also extends into the new bearing path. Also, SKF's R1559TV is a single seal and still gets lube from the rear end where as the Timkin comparable bearing has a double seal. I am thinking one seal is better then 2 as the inner seal would ride on the damaged part of the axle and not last long anyways. I am also thinking on this route as if it doesnt work out the worse case is pull the axle and replace it.

Thanks for the help as always!
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