Yep, I have a 2nd/3rd shift mentality. Plus I didnt really have the money to buy the rear but I couldn't pass it up, so I was up posting "for sale" adds to parts I dont need, to recoupe my money. Know anyone that needs 66 Caprice AC stuff?
Great find at a phenomenal price. (just the empty housing is worth $500 bucks where I live) So post the code numbers and give me a clew as to year it was installed in to find out what gears it left the factory with.
axle- FM 0310G2
Other codes- GM57 and CON 1
The guy I bought it from said it was a 3.08 open but I did find the "FM" code in different years meant 3.73? He had another 12 bolt in his car so I guess its possible he swapped the internals to the other housing?
There was no FM in 1969 (your date code of Feb 1969) it must be an EM. It is a good score because it is a Heavy Duty BBC open rear end with 3.07:1 gears. It was made by Detroit Gear. What is inside the case I have no idea now.
Yep, it is a 4 arm housing. Which is great because my car is a 4 arm car, OE 300hp 327 car. Too bad I dont have the original motor though. I popped the back cover off real quick and its definitely an open and I counted 44 teeth on the ring gear.
Dave, Ok I rechecked my stuff, you are correct, it was an "E" and I recounted my gear teeth and they are 43 and 14 which is a 3.07. So I guess its safe to assume that it may be the stock internals also.
Here's some before, during, and aftre pics. The paint I used ia called Rustoleum Hammered Black. Its the brush on style. IMO the rattle can hammered paint sucks. I've done a few housings with this stuff and everybody swears it powdercoated.
I got another 12 bolt for $225 for a friend of mine. Can you decode the axle #s for me.
This is also I believe to be a HD rear because it also has the dual UCA mounts.
date- L305, which I believe means December 30, 1965. I was told the rear was out of a 66 SS Impala. With the late 65 date code I would think the rear did end up in a 66 model.
It has a open diff with a 3.07
I've got some bad news, and some good news.
First the bad news: it is a 1965 Chevelle rear end. Now the good news: it is a HD Z-16 12 bolt rear end out of a 1965 Chevelle. The Z-16 is the rarest car option on the planet. That rear end is probably worth it's weight in gold. To get an idea how much it is worth ask this same question over on Team Chevelle.
I dont think its a Z16 rear. I think it must be an Impala rear that just coincidently got the "GA" code. From the research i've been doing, the Z16 rear used cut down Impala axle tubes because they were heavier duty than the standard Chevelle tubes. I would assume a bigger wall thickness.