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Greg Reid · 04-13-2019, 01:29 AM

Quote:

Originally Posted by 54nomore

The bearing seats against a shoulder. I think you'd be able to see if it wasn't pressed on far enough.

Yeah, there is a very defined stop where the bearing bottoms out. You would see a gap between the stop and the bearing if it wasn't seated. I'll measure the overall length of my axles when I get home.

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Greg Reid · 04-13-2019, 04:47 AM

Quote:

Originally Posted by punkin

The measurement being asked for by the brake manufacturer is the distance between the face of the axle housing and the face of the axle;

I just realized after looking at your diagram again that I measured from the rear of the axle flange, not the front. Add the thickness of the flange to my measurement and it will increase by at least a quarter inch.

Greg Reid · 04-13-2019, 08:34 PM

I just checked and the flange is .38".. so that plus the 2.4" that I measured before makes it 2.78" ...just about where they told you.

punkin · 04-13-2019, 09:15 PM

I'm completely baffled.

The axles are 29.75" long
The bearings do appear to be bottomed out on the axle
The bearing does stick out of the axle housing by about .1"
Yet the distance from the axle housing flange face to the axle hub face is just over 3 inches.

Authentic-242 · 04-13-2019, 10:01 PM

Take your calipers and measure the width of the bearing (in the direction of the axle length). If the wrong sealed bearing was pressed on the axle and it is wider than what was specified for your rear end year, then that would force the axle bearing to stand proud relative to the housing flange face when inserted and seated into the bearing counterbore. Just compare that dimension to what is correct for the proper bearing (dimensions can be found on sites like RockAuto)

Greg Reid · 04-14-2019, 11:17 AM

Quote:

Originally Posted by punkin

I'm completely baffled.

The axles are 29.75" long
The bearings do appear to be bottomed out on the axle
The bearing does stick out of the axle housing by about .1"
Yet the distance from the axle housing flange face to the axle hub face is just over 3 inches.

How are you measuring the axle? I'll measure mine for comparison.

punkin · 12:22 PM

I thank you very much! I found some specifications on line for the bearing and spacer and what I have installed seems to match. The bearing at about .6" thick and the spacer at .66" thick. A picture worth a 1000 words as they say;

gtohunter · 04-14-2019, 01:03 PM

The bearing shoulders out leaving it protruding from it's bore, which acts as a pilot for keeping the backing plate concentric with the axle.

punkin · 04-14-2019, 01:36 PM

I thank you. I don't believe I'm concerned with the bearing protruding from the housing but rather the total axle offset. (axle housing flange to axle hub front surface). I'm told by Wilwood this should be 2.75" where mine is actually 3.1. If I stack up the measurements from the backside of the bearing spacer, everything looks correct but then it seems I have an extra .25" in axle length between the front of the axle bearing and the axle hub mounting flange. I haven't yet located any drawings/diagrams with this much detail to be certain where the extra .25 inches may be coming from.

Greg Reid · 06:13 PM

I checked overall length from the splines to the flange face and it measures 29.75" . This is an A body by the way...not sure if there is anything different with the F body spacing?

Authentic-242 · 09:03 PM

The 66-69 GTO/Lemans, 67-69 Firebird and 69 GP 8.2 BOP axle are all listed as 29-3/8 long, 28 spline. Greg stated the flange measured 0.38" so add that and you get 29.76" if you measure from the outside flange face to tip of axle, so the axle appears correct. On another note, put a thin layer of flexible putty on the edge of the bearing retainer and then insert the axle into the housing to be sure the bearing retainer isn't bottoming out on the oil seal preventing the axle from fully seating - probably a waste of time since the 0.1" bearing protrusion is confirmed by Greg as well. I mention this since the face of the oil seal looks a little scored in your photo and nothing should be making contact with that surface

punkin · 09:11 PM

Quote:

Originally Posted by Authentic-242

The 66-69 GTO/Lemans, 67-69 Firebird and 69 GP 8.2 BOP axle are all listed as 29-3/8 long, 28 spline. Greg stated the flange measured 0.38" so add that and you get 29.76" if you measure from the outside flange face to tip of axle, so the axle appears correct.

Thank you everyone for taking the time to respond and to those who pulled parts for photos and measurements.

I think I have the mystery solved. I've had a few exchanges with the owner of JD Race and Restorations and I'm pretty sure he's got it figured out. He asked for one additional close up of the axles and it turns out, my axles have an additional shoulder which is for an "oiled bearing" axle setup. I think they're usually found in 72 and newer set ups. I really don't know but this was something that caught his eye. The stacked measurements of the bearing, collar and the fitment into the axle housing is all correct and can be used in drum brakes but there is an additional .75" or so additional axle length that isn't there on the original axles. Bottom line, my axles are not original and I'm now ordering a set of Yukons from him.

Let me tell you, if you ever need axles or diff. parts, give this guy a call. He's a saint and will share info with you. There was a really really good chance that he was not going to make a sale on me because we both thought my axles were good but, he did homework and followed up. He earned my business. http://www.jdrace.com/

Note the extra shoulder;

Greg Reid · 04-15-2019, 09:54 PM

How many splines on that axle?

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punkin · 04-15-2019, 10:14 PM

Quote:

Originally Posted by Greg Reid

How many splines on that axle?

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Just to be sure...I counted them just now...28

Greg Reid · 04-16-2019, 01:59 AM

Yup.
So, you are saying that in this photo, the bearing is bottomed out on one shoulder and the visible shoulder is a second one?

punkin · 04-16-2019, 06:07 AM

Quote:

Originally Posted by Greg Reid

Yup.
So, you are saying that in this photo, the bearing is bottomed out on one shoulder and the visible shoulder is a second one?

That's what was explained to me. This additional machined surface would be used for an external seal. When I place my order later today, I'll try to get a little more info on what the application for this axle would have been.

Greg Reid · 04-16-2019, 11:53 AM

Thanks. I'm trying to learn more about these myself.

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antique69lemans · 04-16-2019, 01:32 PM

I don't understand how the drum ever covered the brake shoes if this is the case. It would require different backing plate or drums ?

punkin · 04-16-2019, 06:29 PM

Quote:

Originally Posted by antique69lemans

I don't understand how the drum ever covered the brake shoes if this is the case. It would require different backing plate or drums ?

The overall offset difference is only 1/4". The shoes were fully inside the drum. Wouldn't know it unless you went looking for trouble like I did.

HWYSTR455 · 04-17-2019, 07:53 AM

Yeah, Jim (monzaz) also posts here, as well as on classicoldsmobile.com, he has helped many as well as I with the 8.2/8.5s. ol' Pinion Head here also is very knowledgeable on 8.2/8.5s

https://classicoldsmobile.com/forums...seal-help.html

Here's a thread with some additional links to info on 8.2/8.5s:

http://www.forums.maxperformanceinc....highlight=axle

I didn't realize Yukon made replacement axles, or maybe they weren't at one time preferred, not sure, but I ended up getting an axle from Dutchman.

.

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