8 3/4 axle offset a body brakes, DeJaVu?

[mycuda]

Because of my recent Dimentsia...please set me straight....LOL

Stock a body 10" 1.75" drum brake set up VS. b body 11/12 "2.5" drum brake set up

So, axle offset difference is only 11/16" (eachside)of overall track difference? between them?

On early A it makes a difference even with springs at rail.For keeping bigger tires under car.
I thought it was more........

Thanks, Dave

 

[dukeboy440]

Moparts on the Web - Main Index

 

[doug 371]

I think its more like 3/8 ish

 

[mycuda]

I guess I should clarify I'm talking drum to drum with big brakes vs. Small brakes on a body rear end.(8 3/4)

Thanks.
Dave

 

[72bluNblu]

Moparts on the Web - Main Index

View attachment 1715126769

Once more, with feeling- THIS CHART IS GARBAGE!!!!

The majority of the dimensions it lists are wrong. The A-body dimensions are completely wrong, the B-body dimensions are completely wrong, most of the numbers it lists are just flat out incorrect. Delete it from your files, stop posting it, let the damn thing DIE.

There's a great list right here on this forum An accurate 8 3/4" rear axle width list

For the OP, a SBP A-body 8 3/4 is 57 1/8", an A-body 8 3/4 with BBP axles and brakes is about 57 13/16". So yes, about 11/16" wider for the whole axle, a bit less than 3/8" per side.

 

[dukeboy440]

Once more, with feeling- THIS CHART IS GARBAGE!!!!

The majority of the dimensions it lists are wrong. The A-body dimensions are completely wrong, the B-body dimensions are completely wrong, most of the numbers it lists are just flat out incorrect. Delete it from your files, stop posting it, let the damn thing DIE.

There's a great list right here on this forum An accurate 8 3/4" rear axle width list

For the OP, a SBP A-body 8 3/4 is 57 1/8", an A-body 8 3/4 with BBP axles and brakes is about 57 13/16". So yes, about 11/16" wider for the whole axle, a bit less than 3/8" per side.

The link and info in your thread is from the EXACT same place I linked in my post above. The image also came from Moparts..........

So which is correct.....

 

[AJ/FormS]

The chart in post #2 appears to measure from the ends of the axles tubes and references those as the flanges, and NOT the axle flanges, so it's almost kinda useless, cuz you would have to add the dimensions for whatever brake you might want to run.
But even then it doesn't seem to add up right.

 

[mycuda]

The chart in post #2 appears to measure from the ends of the axles tubes and references those as the flanges, and NOT the axle flanges, so it's almost kinda useless, cuz you would have to add the dimensions for whatever brake you might want to run.
But even then it doesn't seem to add up right.

I remember that 11/16 number so there's only 3/8 difference between the two brake sets eachside on that a body 8 3/4 which isn't much.
Gonna have to modify inner well a bit.
And go with bigger rear brakes.

Thanks, Dave

 

[72bluNblu]

The link and info in your thread is from the EXACT same place I linked in my post above. The image also came from Moparts..........

So which is correct.....

Not that stupid picture.

I've cross checked most of the information posted in the chart in the chart that I linked, and even added some info to the second chart. I've personally checked the A-body 8 3/4 measurements, both SBP and BBP, as well as the E-body, 3 or the B-body, C-body, and truck 8 3/4 dimensions listed. They're spot on.

The chart in post #2 appears to measure from the ends of the axles tubes and references those as the flanges, and NOT the axle flanges, so it's almost kinda useless, cuz you would have to add the dimensions for whatever brake you might want to run.
But even then it doesn't seem to add up right.

The chart in the link references "flanges" as the housing flanges. So the "flange to flange" measurement in the link, which is is sticky on this forum, is the width of the housing. It's very helpful in identifying axle housings, and you can take that measurement by yourself with a tape measure, unlike the other one. If you scroll down, you'll see that link does include the drum to drum measurements.

The "drum to drum" measurement in that chart is a wheel mount-to-wheel mount measurement. It's the width of the axle with the drums installed, which is exactly the measurement you need for measuring wheel backspacing. And again, I've checked most of the dimensions listed, everything I've checked has been accurate. Unlike the first picture, which is almost 100% wrong.

 

[dukeboy440]

Not that stupid picture.

I've cross checked most of the information posted in the chart in the chart that I linked, and even added some info to the second chart. I've personally checked the A-body 8 3/4 measurements, both SBP and BBP, as well as the E-body, 3 or the B-body, C-body, and truck 8 3/4 dimensions listed. They're spot on.



The chart in the link references "flanges" as the housing flanges. So the "flange to flange" measurement in the link, which is is sticky on this forum, is the width of the housing. It's very helpful in identifying axle housings, and you can take that measurement by yourself with a tape measure, unlike the other one. If you scroll down, you'll see that link does include the drum to drum measurements.

The "drum to drum" measurement in that chart is a wheel mount-to-wheel mount measurement. It's the width of the axle with the drums installed, which is exactly the measurement you need for measuring wheel backspacing. And again, I've checked most of the dimensions listed, everything I've checked has been accurate. Unlike the first picture, which is almost 100% wrong.

That stupid picture did come from moparts. That's where I downloaded it from a long time ago. That said, thank you for letting me know it's not accurate.

 

[72bluNblu]

That stupid picture did come from moparts. That's where I downloaded it from a long time ago. That said, thank you for letting me know it's not accurate.

Oh I know it's from Moparts. Same as the accurate list that I posted and was stickied here An accurate 8 3/4" rear axle width list

But the picture conflicts with the other list, and I happen to know the other list, also from Moparts, is correct. Or at least, every measurement on it that I've been able to check myself is correct, and that actually makes for about half of the rear axles listed. On the flip side, I know for a fact that over half the measurements on that picture are wrong. The most important ones are. The A-body measurement is totally wrong. And so is the B-body measurement, because there are actually 6 different B-body 8 3/4 axle widths. The measurements for the A and B body rear axles are probably the most important for users on this site, so, that picture is worse than useless. Because if you use the dimensions in that picture to say, calculate backspace, well, you'll end up with wheels that don't fit.