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I googled and yahoo'd but didn't find conclusive information.

Are any of the Catera, CTS, CTS-V rears interchangable with the GTO rear?

IIRC, the Catera and CTS had 3.90 and the CTS-V has a 3.73 IIRC?

Are the Catera and CTS a Dana 40?

Is the GTO rear a Dana 60 or 80?

I assume the 3.73 gear sets sold by vendors will not fit the 2005 GTO rear since it is reported to have a beefier pinion gear?

Randy
 

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Good question! I think the best way to find out would be to look on the tag of the diffy's in question to see how similar they are. Main thing to look for on the physical differential would be the bolting of the driveshaft to the diffy and the cv joints to the diffy. That would be a good cheap switch out if they are the same.
 
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