12 bolt ID

[CFH87]

I've just picked up a 12 bolt with these id tags, but couldn't find the stamping's for the axle housing. What I've got so far is 3959038 no letters after that, CM2 DN, and what looked to be K28O? It measures 55 and 3/8'' in length for the backing plates. Any help would be appreciated so far I have found its out of a 69 chevelle?

 

[monzaz]

That is what you have a 1968 1969 A-body GM 12 Bolt CHEVY rear 30 spline axles Will fit all 1968-1972 Chevelle El Camino 1970-1972 Monte carlo
Will also fit 1967-1972 Buick Skylark, Pontiac GTO - Tempest- Lemans, Oldsmobile Cutlass 442 -SX T-37

Here is a LINK http://www.jdrace.com/diff_id/12bCHEVY.htm


Jim
J D RAce