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tcl71 · 09-16-2007, 09:48 PM

Hi Guys,

I have been searching for info on a 12 bolt rear I have, and stumbled across this site.
The axle measures about 54-55 inches from backing plate to backing plate, and I think that's the right width for a Cutlass.

I believe it's an olds type "O" with a 4.33 posi, from what I have found on the net TY is the code for that gear. I have taken the cover off, an it has a 9 tooth pinion and found that's correct for that gear.I have cleaned the front passenger side axle tube and can not find any codes, but on the back side of that tube TY is stamped up side down.

The only other number's I can find are on the center section and looks like a date code of 8-5-70...the 70 is very hard to read so I could be wrong about that.

So far I have found that this rear was available for 68-69, not sure about 70.Could it be that it was an over the counter part at the dealer, and that's why the code is not where it should be?

Any one have any thoughts on what it might be out of, or if it would be worth any thing?I realise a 4.33 is a lot more gear than most people are looking for.

Sorry for the kind of long winded post,any thoughts or info on this would be kindly appreciated.

Thanks, Tom

09-16-2007, 09:48 PM	#1 (permalink)
tcl71 Junior Member Join Date: Sep 2007 Posts: 2	TY code type "O" 12 bolt info needed. Hi Guys, I have been searching for info on a 12 bolt rear I have, and stumbled across this site. The axle measures about 54-55 inches from backing plate to backing plate, and I think that's the right width for a Cutlass. I believe it's an olds type "O" with a 4.33 posi, from what I have found on the net TY is the code for that gear. I have taken the cover off, an it has a 9 tooth pinion and found that's correct for that gear.I have cleaned the front passenger side axle tube and can not find any codes, but on the back side of that tube TY is stamped up side down. The only other number's I can find are on the center section and looks like a date code of 8-5-70...the 70 is very hard to read so I could be wrong about that. So far I have found that this rear was available for 68-69, not sure about 70.Could it be that it was an over the counter part at the dealer, and that's why the code is not where it should be? Any one have any thoughts on what it might be out of, or if it would be worth any thing?I realise a 4.33 is a lot more gear than most people are looking for. Sorry for the kind of long winded post,any thoughts or info on this would be kindly appreciated. Thanks, Tom