12 bolt need help with I.D.

[stock eliminator]

the tube is stamped KDC 251.. What's it out of?????
I have pic also

[Dragsinger]

since it is out of a Chevelle that narrows the choices. Those were used from 1964 - 1972

The 1964 - 1967 were more narrow than the 1968 - 1972. So if someone knows the width of either the early or later, we will have the answer.

[stock eliminator]

how do you know its out of chevelle?

[Alan Roehrich]

It is either out of a Chevelle/Monte Carlo of some vintage, or out of a big car (Impala, Caprice, wagon) because it is set up for a four link and coil springs.

[FED 387]

Housing widths --------backing plate to backing plate
64-67 Chevelle ---61 inches
68-72 Chevelle/Monte Carlo----62 inches
65-70 Big Car----62.4 inches

Comp 387

[FED 387]

upon further review it is probably out of a early model year 1972 el camino/monte carlo/chevelle
KD ---is the gear ratio 2:73
C------is the assembly plant--- Buffalo
251---is the assembly day of the year---September 8, 1971

Comp 387

[FED 387]

forgot to add check the differential casting-- for a 12 bolt it should be 3969278
Comp 387

[Dragsinger]

"how do you know its out of chevelle?'

I have a good eye for rear ends! [smile]

[Mark Yacavone]

The big car 12 bolt doesn't have the ears on the center casting.

[Alan Roehrich]

Originally Posted by Mark Yacavone

The big car 12 bolt doesn't have the ears on the center casting.

Mark, the one we have does. Well, it did, they were cut off. The Chevelle housing does not have the big inner pinion bearing, or the big carrier bearing saddles. This housing has the big inner pinion bearing and the ears cut off of the top of the center casting, or at least almost all of them are gone. I've seen stock Chevelle and Camaro housings cut for the big carrier bearings, but I've never seen one cut for the big inner pinion bearing. It might have been there on some COPO Chevelles, but those cars were very rare, and I doubt anyone cut one of the housings up like that to fit a Camaro.