Will a 50.75" 8.75 flange to flange axle housing work?

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cawcislo

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Looking to swap out the 8.25 axle for an 8.75 in my 70 duster. There's a 50.75" flange to flange shortened axle housing that I was looking at, but don't know if that would work. End goal would be to put some offset shackles in the rear but I don't want to do any mini tubs. Looking to go with aftermarket rear wilwood disc brakes. Would I be forced to go with expensive aftermarket offset wheels to counter the shortened axle, or would wheel spacers work? Or is there other options I'm not considering? Or should I save myself the hassle and look for a stock length A body housing? Thanks.
 
cawcislo said:
Looking to swap out the 8.25 axle for an 8.75 in my 70 duster. There's a 50.75" flange to flange shortened axle housing that I was looking at, but don't know if that would work. End goal would be to put some offset shackles in the rear but I don't want to do any mini tubs. Looking to go with aftermarket rear wilwood disc brakes. Would I be forced to go with expensive aftermarket offset wheels to counter the shortened axle, or would wheel spacers work? Or is there other options I'm not considering? Or should I save myself the hassle and look for a stock length A body housing? Thanks.
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I'm thinking the A body axle is actually 54.5?, so that would be a great choice I think.
The Duster has larger wheel openings than the Darts and I'm pretty sure I have seen and heard of 295 tires fitting with no mods to the car.

Let me check that length and get back to you.
Ok well I was wrong:D

"A BODY ’66-’72: 57-1/8″ so you would have about 3.5 inches to deal with on each side.
 
This chart actually disagrees and has more what I was thinking in the first place.

width-1.jpg
 
Seems like there is a lot of misinformation about axle widths. I would measure the existing 8-1/4 and then see if it would clear the 50-3/4 inch housing using the 3/4 inch inboard spring mount and shackle kit.
 
R4Sedan said:
I'm sorry you guy's are talking 8 1/4 rear.
I'm talking 8 3/4 my bad. That chart is wrong for those dimensions.
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I have trouble remembering the different rear axle types have different widths. You'd "THINK" they'd all be the same.
 
RustyRatRod said:
I have trouble remembering the different rear axle types have different widths. You'd "THINK" they'd all be the same.
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The ones I have dealt with have been the same on the stock spring pad widths and similar axle lengths (outer axle flange to outer axle flange) but the axle tube lengths and backing plate to backing plate measurements vary by the rear brake drum widths. I am sure there are exceptions, though!
 
Garrett Ellison said:
The ones I have dealt with have been the same on the stock spring pad widths and similar axle lengths (outer axle flange to outer axle flange) but the axle tube lengths and backing plate to backing plate measurements vary by the rear brake drum widths. I am sure there are exceptions, though!
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I'm narrowing a Ford 9" now. It's gonna end up "somewhere" between the stock 8 3/4 housing width of 52 1/8" and 50" and "I don't care" where. The pinion will be centered regardless. LOL
 
RustyRatRod said:
I'm narrowing a Ford 9" now. It's gonna end up "somewhere" between the stock 8 3/4 housing width of 52 1/8" and 50" and "I don't care" where. The pinion will be centered regardless. LOL
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Cool, let me know when it's ready and how much shipping will be to AZ. :D
 
50.75 what are you measuring? The bare housing flange to flange? Or the wheel to wheel mounting flange with the axles in?
 
TrailBeast said:
This chart actually disagrees and has more what I was thinking in the first place.

View attachment 1715367628
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Damnit!!!

Every time I think this chart has died out someone brings it back. Trailbeast, I expect better from you. More than half of the dimensions on that chart are wrong. Some of them painfully so. I mean seriously, I know that YOU know there's more than two B-body axle widths.

Worst Mopar chart in the history of the internet. :BangHead:

The list you need is literally stickied at the top of this forum. An accurate 8 3/4" rear axle width list

cawcislo said:
Looking to swap out the 8.25 axle for an 8.75 in my 70 duster. There's a 50.75" flange to flange shortened axle housing that I was looking at, but don't know if that would work. End goal would be to put some offset shackles in the rear but I don't want to do any mini tubs. Looking to go with aftermarket rear wilwood disc brakes. Would I be forced to go with expensive aftermarket offset wheels to counter the shortened axle, or would wheel spacers work? Or is there other options I'm not considering? Or should I save myself the hassle and look for a stock length A body housing? Thanks.
Click to expand...

Your current 8.25" housing is 51.5" flange to flange, so as mentioned a 50.75" 8 3/4 isn't actually that different from what you have now. You'd lose 3/8" worth of clearance per side to the springs assuming you're going to run BBP axles. If you're going to run axles with the SBP flange offset, you'd actually lose .75" per side compared to your current rear axle because of the difference in the flange offset from BBP to SBP.

As far as wheel fit, you'd be looking at wheels with a 0 offset with BBP axles. So, if you're sticking with 15's back there then you shouldn't have a big problem finding wheels. The disk brakes tend to widen the track width a little too, so you'd make some of it up there.
 
72bluNblu said:
Damnit!!!

Every time I think this chart has died out someone brings it back. Trailbeast, I expect better from you. More than half of the dimensions on that chart are wrong. Some of them painfully so. I mean seriously, I know that YOU know there's more than two B-body axle widths.

Worst Mopar chart in the history of the internet. :BangHead:

The list you need is literally stickied at the top of this forum. An accurate 8 3/4" rear axle width list



Your current 8.25" housing is 51.5" flange to flange, so as mentioned a 50.75" 8 3/4 isn't actually that different from what you have now. You'd lose 3/8" worth of clearance per side to the springs assuming you're going to run BBP axles. If you're going to run axles with the SBP flange offset, you'd actually lose .75" per side compared to your current rear axle because of the difference in the flange offset from BBP to SBP.

As far as wheel fit, you'd be looking at wheels with a 0 offset with BBP axles. So, if you're sticking with 15's back there then you shouldn't have a big problem finding wheels. The disk brakes tend to widen the track width a little too, so you'd make some of it up there.
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Yea, well the problem is actually that I can't ever remember which list is which.:D
Maybe I should take a minute to mark them wrong and right.
 
TrailBeast said:
Yea, well the problem is actually that I can't ever remember which list is which.:D
Maybe I should take a minute to mark them wrong and right.
Click to expand...

Why? When you have bluNblu around. lol
 
Just to come back to this, my housing ended up at a tick under 51 3/4".
 
Did you center the poinion like you said you would? Because it needs to be offset tot he passenger side about 1 1/2" to center the driveshaft in the tunnel.
 
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