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dub 01-24-2013 11:06 PM

Rear End Conversion?
Hey Guys,
I was wondering if there was a cross reference site that I could use to see which pozzi rear end would fit my 72 chevelle.
Or does anyone know off hand?
Its a 72 Malibu with a 383 stroker. 12 bolt one wheeler peeler.
Any info would be helpful.

Thanks Guys.


big gear head 01-25-2013 06:41 AM

What gear ratio is in it? If it has a 2.73 or 2.56 then you afre going to have to find a used 2 series Eaton Posi. If it has anything between 3.07 and 3.73 then you can use a used 3 series Eaton or get a new 3 series Eaton Posi. If it has the thin 4.11 to 6.00 gears then you are going to need a 4 series Eaton Posi, new or used.

All of the Chevy car 12 bolt rear ends use the same internal parts, Chevelle, Camaro, Nova, Impala, but finding a used one in a salvage yard will be almost impossible. The 12 bolt was only made from '65 to '72, and just about every one has been snatched up. If you can use the 3 or 4 series then I reecommend just getting a new one. Tom's Differentials has good prices on the Eaton Posi and he can get you the shims and bearings that you need to install it.

If you are wanting to change the complete rear end then the '68 to '72 Chevelle, El Camino and '70 to '72 Monte Carlo are the only direct fit 12 bolt rear ends. The '65 to '67 Chevelle and El Camino 12 bolt rear ends are 1 inch narrower, but still bolt in. They will also bring a higher price.

dub 01-27-2013 08:12 PM

Thanks for the info.
Ill chedk around locally for a rear end with the specs you stated.
Another question:
Im not much of a differential guy...
Can I just swap out the internals of the existing rear end and make my current one a posi? or do I need to get an entire new one?


big gear head 01-28-2013 05:58 AM

change to posi -
Read this, post number 2. This is for the 8.5 10 bolt. The only difference is that the 12 bolt has 3/8 ring gear bolts with right hand threads and the torque on those bolts is 40-45 foot pounds.

All you need is a new Eaton Posi, a set of bearings and a super shim set. You need to know what your gear ratio is before you buy anything.

dub 01-28-2013 09:12 PM

Thanks again. I am going to figure out what my gear ratio is and then order the correct pozzi I need.

Thanks for the help.


big gear head 01-29-2013 06:01 AM

Most people seem to want to go to Summit or Jeg's for rear end parts. I recommend Tom's Differentials, Randy's Ring & Pinion or DTS for these parts. They are not just some people sitting in front of a computer reading what is on the screen. They know rear ends and will get you exactly what you need at a good price. They also have better parts that Summit and Jeg's.

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