I've checked all the material I have and found only one question and one answer to the "original question".
Click onto the Big Block Mopar site and scroll down to the Q&A section. Look at the Q: from Tony Zatkovic on Sept. 20, 2013, he asks this question and you can read the reply from Big Block Mopar that tells you NO and why.
From: "1962to1965mopars" <1962to1965mopars@xxxxxxxxxxxxxxxx>
To: "1962to1965mopars" <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Tuesday, September 2, 2014 12:00:03 PM
Subject: Re: Mopar Tapoered Axle Brake Coversion Link
OK
I will add the following to the list of non answers to the original question of replacing tapered axles in a 63 8 3/4 housing with later flanged axles...
- complete '65 rear axle assemblies will bolt right in...
- you can make anything work if you throw enough money at it...
anyone else have any tidbits of knowledge that they want to bestow onto the rest of us?
can anyone answer the tapered to flanged axle conversion question?
From: Gary Wilson <gwwilson70@xxxxxxxxx>
To: 1962to1965mopars <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Tuesday, September 2, 2014 8:30 AM
Subject: Re: Mopar Tapoered Axle Brake Coversion Link
I took a 65 cornet rear housing complete from drum to drum and install it in my 64. bolted right in. measure the one from the 66 from inside backing plate to backing plate and see if it matches the one from your 63 in width. may have to move spring pads a little bit and then again maybe not
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