C body axle

[Roadwelder519]

I have the opportunity to purchase a 1967 net Yorker 8 3/4 I am getting conflicting results from the internet Is this a doable swap into a 72 challenger? Yes I do know anything is doable with enough work but is this a easy swap thanks

 

[Mr Cuda]

It will bolt right in. The differences are:
Total width is 1/4"? narrower
Axle flange thickness is narrower
Brass brake block and vent location is different, so pre built brake lines won't work
It may have 11"×2" brakes

 

[Roadwelder519]

Woohoo 200 bucks well spent then !

 

[Mr Cuda]

I'm suprised you need an 8 3/4" housing as all 72 up ebodies should have come with one.
Unless missing? Or you just want the pumpkin?

 

[Xcudame]

The C-Body rear assembly is 63.4" from flange to flange while the E-Body is 60.7". Also on the C-Body, the perches where the leaf springs attach are 47.3" apart while on the E-Body the leaf spring perches are 46.0" apart. To use the C-Body Rear axle, you'd have to cut and weld the spring perches to 46.0" apart. And you'd have to use wheels with about 1 3/8" more backspacing. Center section (pumpkin) would interchange in all rear axles.

 

[heminut]

The C-Body rear assembly is 63.4" from flange to flange while the E-Body is 60.7". Also on the C-Body, the perches where the leaf springs attach are 47.3" apart while on the E-Body the leaf spring perches are 46.0" apart. To use the C-Body Rear axle, you'd have to cut and weld the spring perches to 46.0" apart. And you'd have to use wheels with about 1 3/8" more backspacing. Center section (pumpkin) would interchange in all rear axles.

This ^^^^ is the correct answer.

 

[Mr Cuda]

Actually, I'm not wrong.
47.3 is late C or 71 up B spring pad. (late C is B wagon housing width)
67-70 C is 46.

 

[Roadwelder519]

This is what i am talking about some sites say they will fit some don’t and even here i get conflicting opinions. I am so confused

 

[Mr Cuda]

If you have the axle, measure the spring pad center to center.
The total housing width will correspond with the spring pad.
46- 60.5"overall
47.3-63.4" overall

 

[heminut]

Actually, I'm not wrong.
47.3 is late C or 71 up B spring pad. (late C is B wagon housing width)
67-70 C is 46.

Not according to this chart;

Xcudame is correct and you are wrong.

 

[Roadwelder519]

i verbally committed so we shall see. It gets dropped off in a couple weeks.

 

[Mr Cuda]

Chart is wrong. I don't have my DC book handy.

Calling @Vaanth

 

[heminut]

i verbally committed so we shall see. It gets dropped off in a couple weeks.

Let us know what you find out.

 

[heminut]

Chart is wrong.

Okay. we will see! There is another thread here on the board where this was gone over recently, I just can't find it right now and it's getting late.

 

[Mr Cuda]

I used to save early C body rears to swap into cars with the toy 7 1/4.
There are no more 70 318 or slant cars that still need a rearend swap.
I haven't been able to sell a housing and axles, even for $100. Still have a rack full of clean ones. Last E body width C housing got scrapped.
Now the late C 47.3" housings are a quick sale for73 up B's that had an 8'1/4", or even late C's. Not all C's got an 8 3/4 after 71.

 

[Vaanth]

Chart is wrong. I don't have my DC book handy.

Calling @Vaanth

I have the opportunity to purchase a 1967 net Yorker 8 3/4 I am getting conflicting results from the internet Is this a doable swap into a 72 challenger? Yes I do know anything is doable with enough work but is this a easy swap thanks

The 1967 New Yorker 8-3/4" axle, like other 1965 - 1969 C-bodies, except 1969 station wagons, has a 46" perch to perch center dimension and a 56-7/16", per Chrysler, housing flange to flange dimension. Chrysler lists the housing dimension as the same as the E-body at 56-7/16". The perch dimension is the same between the two axles.

The axle will bolt into an E-body and fit fine, but there are some other areas of note, some of which have been mentioned, as follows:

• The axle vent was relocated ~3-1/2" outward on the axle tube in 1970, so 1970 metal brake lines will not directly fit. The flex hose may reach but a longer hose might be required depending on suspension height and travel.
• The E-body parking brake cables will work with the 1967 axle and brakes, but the 1967 C-body cables may not work on the E-body without modifications.
• The 1970 brake self adjusters differ from the 1967 adjusters, but the parts can be interchanged as a whole.
• The 1967 C-body axle might have 11" x 2" brakes. The brakes and drums will work on the E-body. To switch between 2" and 2.5" requires the backing plate for the respective brake size and associated parts to be used.
• The C-body axle perch angle on the housing is a little different than the E-body as follows:
  • C-body, with the perch sitting level: pinion, or center section housing mating surface, 3 degrees up.
  • E-body, with the perch sitting level: pinion, or center section housing mating surface, 6 degrees up.

The perch angle may not matter, depending on other factors, but checking the driveshaft angles after install might be needed.

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Some references list the 1965 - 1969 C-body 8-3/4" axle housing flange to flange dimension at 56-3/4" and the E-body axle housing flange to flange dimension at 56-31/64". They are essentially the same width though.

1970 - 1974 C-bodies and 1969 C-body station wagons had a perch to perch dimension of 47.3".

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