[punkin]

Hello all,

I wasn't sure where to put this question. I hope this will be ok.

I'm preparing for a rear disc brake conversion. The rear is a 8.2 10 bolt BOP without C-clips (external bearing retainer is used). They want measurements from the face of the rear axle housing and the face of the axle flange. To do this I had to take the brakes off so I could get some calipers in there. From the axle flange face to the front of the axle face is at about 3.08 inches. Wilwood calls this axle offset and seems to think that it should be 2.75 inches.

After taking pulling the brakes and backing plate (I had to pull the axle out for this). I put the the axle back all the way in I noticed that the bearing is still proud of the axle flange at right at .1 inch.

Any thoughts? Should the axle bearing fit further into the axle housing?

[antique69lemans]

Just looked at this last week. That is the thickness of backing plate isn't it ?

[punkin]

Originally Posted by antique69lemans

Just looked at this last week. That is the thickness of backing plate isn't it ?

Not sure I follow but I did just get off the phone with Wilwood to confirm where they wanted the measurements made and they indicated front of the axle housing to the front of the axle flange (no backing plate or retainer should be part of the measurement. Also, just to be sure I had thing seated properly, I bolted up the axle retainer and now see a slight gap between the retainer and the axle housing. This doesn't look right to me.

[Tom Vaught]

That is correct, Have not had a 8.2 axle apart in many years but believe that the backing plate "registers" off of that .100" outboard offset of the bearing. Install the drum brake shoe plate and the retainer should sit flat on the brake shoe plate.

Tom V.

[punkin]

Originally Posted by Tom Vaught

That is correct, Have not had a 8.2 axle apart in many years but believe that the backing plate "registers" off of that .100" outboard offset of the bearing.

Tom V.

Sorry, not sure I follow when you say the backing plate registers off of that. Does my photo appear correct to you where the bearing is slightly out side of the axle housing?

[KEN CROCIE]

wondering if he's using the later (longer) 10 bolt axle shaft ( '68 +) in an earlier housing.

[Greg Reid]

I just replaced the bearings on an 8.2 10 bolt and put one of the axles back in today. I'm pretty sure the bearings on mine are a little further in that what your photo shows. I can check it tomorrow although I'm not 100% positive I understand the two points of measurement?

They want measurements from the face of the rear axle housing and the face of the axle flange.

[Kenth]

Bearing should be flush with flange.

[punkin]

Originally Posted by KEN CROCIE

wondering if he's using the later (longer) 10 bolt axle shaft ( '68 +) in an earlier housing.

Thanks to you and to everyone else for the thoughts and suggestions. I'm 100% positive the housing is original to the car but I do know that the axles were replace many many years ago. Also at one point the differential was changed out to a posi unit (cone style).

I had this work done by a shop and this being the first time I've torn the brakes down to this extent I'm seeing this. The bearing sticking out of the end just seems wrong to me but I haven't seen any photos or documented references to be sure.

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;

[antique69lemans]

Originally Posted by Tom Vaught

That is correct, Have not had a 8.2 axle apart in many years but believe that the backing plate "registers" off of that .100" outboard offset of the bearing. Install the drum brake shoe plate and the retainer should sit flat on the brake shoe plate.

Tom V.

Tom's description is right.

Look at a parts diagram. There is a retainer/gasket/backing plate/gasket/flange. The backing plate takes up that space and requires two gaskets .

[Skip Fix]

I just had the 8.2s axles out of my 65 GTO to put new backing plates and brakes on it. Pretty sure mine stuck out that far also. Mine has seals in the axle tube and had some pink looking grease leaking out the sealed bearings a little also.

[Greg Reid]

I just slipped the axle back into mine just to see and it stands out exactly .100 inch. The flange to axle end is 2.4 inches.


Sent from my moto g(6) play using Tapatalk

[HWYSTR455]

I'm leaning towards what Ken's saying, or maybe they used a c-clip axle and cut the nub off. Or maybe the bearing isn't seated all the way on the axle.

Pull the cover and look at it installed maybe? Or measure the axle?

Out of curiosity, what body are you working with?

.

[punkin]

Originally Posted by Greg Reid

I just slipped the axle back into mine just to see and it stands out exactly .100 inch. The flange to axle end is 2.4 inches.
Attachment 509996

Sent from my moto g(6) play using Tapatalk

I really thank you all for taking the time with this.

So, if my axle bearing is in proper relationship with the axle housing and my axles are sticking out further than expected (2.75"), then either the axles are too long or the bearings are not pressed down far enough. I'll measure the axles this afternoon.

Does anyone have a measurement on how far the bearing should be pressed down? Where is this measurement taken?

Again, thanks VERY much everyone.

[punkin]

Originally Posted by HWYSTR455

I'm leaning towards what Ken's saying, or maybe they used a c-clip axle and cut the nub off. Or maybe the bearing isn't seated all the way on the axle.

Pull the cover and look at it installed maybe? Or measure the axle?

Out of curiosity, what body are you working with?

.

I'll pull the axle out and get a photo of the end. The car is a 1968 Firebird.

[punkin]

Originally Posted by HWYSTR455

I'm leaning towards what Ken's saying, or maybe they used a c-clip axle and cut the nub off. Or maybe the bearing isn't seated all the way on the axle.

Pull the cover and look at it installed maybe? Or measure the axle?

Out of curiosity, what body are you working with?

.

I measured the axle (from spline end to flange face) 29.75". I don't think this is a cut-off axle (photo attached).

[HWYSTR455]

Nope, sure isn't. Can you tell if the bearing is fully seated?


.

[punkin]

Originally Posted by HWYSTR455

Nope, sure isn't. Can you tell if the bearing is fully seated?


.

I really believe that it is seated. A very solid "thunk" once it keys in. Either it's bottomed out at the spline end or the bearing is bumping up to the end of the seat. I've pulled it out reinserted several times and tried clocking it in for different engagements. The end result is always the same.

Does anyone have a measurement as to how far onto the axle the bearings should be pressed? I've been googling this and can't seem to find anything. Maybe my search terms aren't sound.

[antique69lemans]

Originally Posted by punkin

I really believe that it is seated. A very solid "thunk" once it keys in. Either it's bottomed out at the spline end or the bearing is bumping up to the end of the seat. I've pulled it out reinserted several times and tried clocking it in for different engagements. The end result is always the same.

Does anyone have a measurement as to how far onto the axle the bearings should be pressed? I've been googling this and can't seem to find anything. Maybe my search terms aren't sound.

You have a pair of calipers. Measure the bore depth and subtract it from the bearing width.

[54nomore]

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