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72 Disk brake spindles...

TopBanana72

TopBanana72

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OK, I am proceeding on the front end rebuild and ran into yet another snag. Early on, I decided to replace the spindles with new ones, so ordered a pair from Dr. Diff. But when I go to finish the job by putting the rotor on, this spindle is too thick. About 1.36'" verses the old 1.24".
Now what? The Dr. Diff description says specifically: Reproduction forged steel disc brake knuckles fit '62-'72 B-bodies, '70-'74 E-bodies and '67-'76 A-bodies.* There is some caveats mentioned about A bodies, but no other caveats about B bodies.

https://www.doctordiff.com/reproduction-disc-brake-knuckles.html

So I am gathering that these are really 73 and up spindles "designed" to fit the 62-72 b bodies. Other similar ones I saw on other sites mentioned you must use 73 rotors with these. Another seller said you must run 15" wheels (I only have 14's).

As a side note, my original caliper brackets bolt on OK and I didn't have any problems connecting the upper A arm or lower ball joint.

Does anyone know what the full story with this is? Any suggestions? I still have the original spindles I could clean up and use if need be.

IMG_0610.jpg
 
Your now going to be needing 73 up rotors to fit the spindles.
 
hemi71x said:
Your now going to be needing 73 up rotors to fit the spindles.
Click to expand...

I'm OK with that. I imagine the bearings are different size as well.

Do you know if my 72 pin type calipers / pads will work?
 
Your calipers and pads will work. If you use 73 to 76 A body or 73 to 74 E body rotors it should all work fine, including most 14 " wheels designed for discs. The rotors mentioned are 10.95 inches in diameter. You could also run later 11.75 rotors, but you would need the proper caliper brackets, and 15 " wheels. Rotors for those spindles are easy to find and inexpensive. Dr diff has the rotors, as well as many other suppliers.
 
R/T Boy 67 said:
Your calipers and pads will work. If you use 73 to 76 A body or 73 to 74 E body rotors it should all work fine, including most 14 " wheels designed for discs. The rotors mentioned are 10.95 inches in diameter. You could also run later 11.75 rotors, but you would need the proper caliper brackets, and 15 " wheels. Rotors for those spindles are easy to find and inexpensive. Dr diff has the rotors.
Click to expand...

Thanks... Could I use 73 and up B body rotors? or you think I should order the A or E body ones like you said?. I was looking at Rock Auto and under 73 Charger... rotors (for pin type calipers) was mentioned. Just want to make sure I get the right stuff. I'm running out of time for Carlisle :)
 
A,B & E 73 & up use the same rotors.... You'll also need inner bearings & seals.... You should also replace the outer bearings but the old ones will fit...
 
Note to self... You also need the 73 and up disk brake dust shields. The 72's and below have a large boss/lip on the outside facing the rotor. The new rotor won't go on all the way :( . Now I have ordered 73 and up dust shields ... argh. I SOOO want to get this done!
 
Measure your old spindle vs the new one.

73 and up B/F/M/J is 3/8" taller than 72 and down B and E
 
TopBanana72 said:
Note to self... You also need the 73 and up disk brake dust shields. The 72's and below have a large boss/lip on the outside facing the rotor. The new rotor won't go on all the way :( . Now I have ordered 73 and up dust shields ... argh. I SOOO want to get this done!
Click to expand...
Ya, that brings back memories.
Ran across that problem the first time that i did that conversion, a long time ago.
But i just got out the die grinder, and removed the "lip" from the 70-72 shields, once i figured out what was going on.
 
hemi71x said:
Ya, that brings back memories.
Ran across that problem the first time that i did that conversion, a long time ago.
But i just got out the die grinder, and removed the "lip" from the 70-72 shields, once i figured out what was going on.
Click to expand...
I was thinking about doing that.
 
YY1 said:
Measure your old spindle vs the new one.

73 and up B/F/M/J is 3/8" taller than 72 and down B and E
Click to expand...

True, however these particular new "Reproduction" spindles are actually A body knuckles, the same height as the 72 and down B body ones. Once I found them on Dr. Diff, I saw them elsewhere too. You are intended to use these on 72 and down B bodies but with the 73 and up rotors (and splash shields and larger inner bearings). But they keep the same 72 and down geometry regarding upper A arm. This article mentions explains it pretty well.. https://www.cartechbooks.com/techtips/knuckleinterchange
 
That's pretty cool.
 
I know the 71/72 only rotors have been real hard to find for some time.
 
Aargh.. Another note: The dust cap is different 72 and down from 73 up. One more trip to Autozone and I think I'll have this thing on all fours.
 
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