[Chevelle-list] 12 Bolt Posi Rear

[Dale]

Casting number 3875745N shows it to be a 66 12-bolt rear.  CO is 3.31
w/metallic brakes and Positraction.  It's 1 to 2 inches narrower than a
68-72 rear and should have a different spring perch arrangement; lower coil
is larger and a plate bolts it in place as opposed to it sitting on a 'top
hat'.  Honestly, it's worth more to a 66 owner looking for a good rear end
as they're getting harder and harder to find.  Any 68-72 Chevrolet rear
should bolt right in.

You might want to read the bottom of this page -
http://www.chevellestuff.com/generic/axlecodes.htm

Dale McIntosh
1966/67 Chevelle Reference CDs
ChevelleStuff.com


-----Original Message-----
From: chevelle-list-bounces at chevelles.net
[mailto:chevelle-list-bounces at chevelles.net] On Behalf Of Jim Sullivan
Sent: Monday, July 09, 2007 9:37 PM
To: The Chevelle Mailing List
Subject: [Chevelle-list] 12 Bolt Posi Rear

Can anyone tell me what this 12 bolt is out of and will it fit in my 69
Chevelle??  The mountings are a little different, but measure up pretty
close to my 10 bolt.

It's 3.30 gears.
Posi Unit    EO -  30140PMI
Tube Stamped   C00118B
                                  E
Case castings     GM1           3875745N
                                                L306   Looks like?

As always, any help greatly appreciated.
Jim











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