Donnie and Rich are right, the 68-72 are a bit wider.  Here is some info I've gathered that may help.
 
* 1964-67 Chevelle rear ends were manufactured by the Chevrolet Gear and Axle Division.  The housing measures 56.5 inches from flange to flange, and with the brake drums in place, the total width is 60.5 inches.

* 1968-72 Chevelle rear end housings measure 58.5 inches from flange to flange, and with the brake drums in place, the total width is 62.5 inches. 

Rear spring mounting pads differed in that 1964-66 rear ends used a flat pad with a hole drilled in the center. 1968-72 rear ends have circular spring mounting pads, which are 3/4" higher that the early flat pad.

1967 was a transition year in that A-cars might have a 1964-66 style rear end, a 1968-72 rear end (which is wider, and commonly available), or a "hybrid" rear end, which will have the 58.5" width, but with the early spring mounting pad and trailing arm brackets.

Rear upper control bushing eyes differ, and the positioning of the bushing eyes will differ. 1968-72 rear end housings will have a 3/8" forward positioning, which is farther that 1964-67 rear ends.

I had a late model rear end in my 67 for quite a number of years and finally found a 67 rear to bring the tires back in from the fenderwells.  It really limited me on tire and wheel selections.

Dale McIntosh
ACES #1709/TC #92 Gold
67 SS/67 Elky
http://www.dalesplace.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Mel Anderson
Sent: Friday, January 11, 2002 2:14 AM
To: [EMAIL PROTECTED]
Subject: [Chevelle-List] rear end swap

Hi ....I am looking at an add for a re-built 68-72  12 bolt - posi 3.31 rear end that is suppose to be in mint condition......the assembly is drum to drum off a 6cyl wagon and I wanted to know if it could be swapped with my current 67 3.08 10 bolt rear end .
 
Is the drum to drum measurement the same ? is this a do-able swap or do I need a 66-67 rear end housing?
 
Mel
67 Malibu SS
 
 
 
 
 

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