Did the deed... absolutely nothing in the fluid chunk or shavings-wise... looks like an Eaton, I think... (I have no real idea of the gears, except it takes an awful lot of revs to run this at freeway speeds)

http://a414.ac-images.myspacecdn.com/images01/13/l_5e8d5616a1be5447f5e88f6e0ae97e6d.jpg

And the mystery rear end?

http://a345.ac-images.myspacecdn.com/images01/112/l_aecaf8abfd1aacaa01014759169e3c00.jpg

Here's both sides of the internals:

http://a158.ac-images.myspacecdn.com/images01/89/l_d46ee7789c346bab54e03cef17a98cdd.jpg

And this:

http://a962.ac-images.myspacecdn.com/images01/105/l_d2f4d0184835b0bde955bd7e27b14c79.jpg

Any ideas?

I copied all of the numbers down I could find in there...

And I couldn't find any numbers on the outside of the case...

These were in the differential:

On the pinion: 3853008-11 3|9 or 9|9 11 65 with a B in a circle painted on it. Also, the 3|9 or 9|9 has a painted "46" over it.

The spool or whatever had the following number: E0-3014PMI (or 1)

The gear was bolted to a piece with the code "A2C" stamped on the edge.

Any ideas?

9 11 65 = date built. Looks like 65 Chevelle axle with UCA knobs
Look on the ring gear next to the part number will be hyphen numbers giving the gear ratio.

I looked hard at the ring gear and couldn't find any numbers on it. Would that require unbolting it, 'cause I sure don't want to go there. I know even less about setting up a rear end then I do brain surgery.

Could you please do me a favor, now that you have the rear cover off.....Could you check the lower bolt holes, on the passenger side and see if they go through to the inside of the housing.....I installed a new rear end cover, gasket and sealer and it has a slight leak in that area, I was thinking perhaps it's coming out of the bolt hole, if it goes through.....My original cover was leaking in that same area!

If you can count the number of teeth on the ring gear then you can determine the rear end ratio, it would help if you could see in there to count the number of teeth on the pinion gear also.

Apparently, aftermarket gearset. GM has the number of ring gear teeth first then pinion, aka, 41-10 or 37-9, depending upon gear manf. Number would be on the edge of the ring gear.

Since the cover is off, mark each gear on one tooth and count the teeth. Divide pinion tooth count into the ring gear count.

To check the clutches, put a wheel on the ground, trans in neutral, and with a beam torque wrench on a lug nut, t/wrench must be in line with the axle center, O<----, minimum breakaway torque is 35 ft./lbs.