The Stovebolt Site Forums The Shop Area Engine Shop Rear End ID request

I've got a rolling axle assembly - it is "supposed" to be off of a '67 or '68 - but you never know.

I had one numbers book in my hands, but could not find a match for the digits I found.

On the forward facing was:

CFO (CFD?)
90
3977323

I popped it open, and on the ring gear is:
3977334 10 41 376

Teeth count is 41 and 10 if I didn't go crosseyed.

Of course, the big question is, will this fit in my pumpkin? The rear end cover on my '56 looks much bigger than this rolling axle. The swap is likely above my abilities, but I guess first I need to know if the swap is physically possible.

I've got a buddy who suggests that it would be easier to swap the whole rolling axle assembly (which he's done before) than the pumpkin innards (which he's never done). Have not done any measurements yet, though.

Thanks for the help, guys.

Hy cfesting, my newest parts book goes up to 73, and that number is not listed there, so it must be a newer number than 73, the last 3 digits you found [376] could be a date code for march of 76, hope that helps.

Thanks for the info, 3B. That helped get me on the right track. It was also quite a surprise, and a testament to the "you really don't know who replaced what with what" on trucks that have been around for a while.

Using this info (and the interwebs) I believe this is a 14 bolt GM - possibly a a Full Floater with a 10.5 Ring Gear - and from 1976. If anyone can verify this, or add any other geeky info, that would be great. It is a dually, by the way.

And, I also assume that this means no swapping of the innards. Bummer.

Thanks, all!