Help With rear end ID

It's a 2.79 with open (peg leg) diff.
Likely an 8" rear, as the 2.75 is a 9" gear while 2.79 was 8" only IIRC.

Take a pic and I will tell you for sure 8" or 9".

If you can't take a pic:

Try to put a socket on all of the nuts/studs that secure the chunk.
If the socket can fit on all of them, it's an 8". If some will not accept a socket, it's a 9".
Then measure from center to center of each spring pad.
Record the measurement.
Then measure from where one brake backing plate mounts to the housing, straight across to the other.
Record that measure.

Post them here and we can marry up the rear to what cars it fits or came from.

Edit:
My guess, it's a Maverick 8" rear. 2nd guess would be a Granada.

Either of which would bolt right into a 65-66 Stang.
But is still only an 8" rear.

2.79 gears-----8"rear. These came in 67-79 cars. All I think were leaf spring rears, but have differing overall widths. Spring perches will be the same distance apart for all

The second set of numbers on the bottom row indicate the assebly date. "7GA" would be (7) 1967, (G) July, (A) first week of month. So, it's a 1967 8" rearend.

96 DOHC Cobra said:

The second set of numbers on the bottom row indicate the assebly date. "7GA" would be (7) 1967, (G) July, (A) first week of month. So, it's a 1967 8" rearend.

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I second that...
I didn't know the numbers, but the measurement is right for 67-70 Mustang.

This will bolt into your Stang, but will be a little wider than stock.
You can compensate by getting rims in the back with a little more backspace.
About .5" to .75" more BS I believe is what is called for.
Stock rims will work too, they just fit a little more snug.

Dave