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FED 387 · 12-22-2010, 10:27 PM

Larry-348690 is the casting number for a 12 bolt case but look on the top of the passenger side tube more towards the front of the car and there are a series of letters& numbers stamped in the tube---ya probably will hafta wire brush the tube clean to find those numbers---give me all of the numbers/letters and I can tell ya most of what ya want to know as far as WHAT IT WAS FROM THE FACTORY---now if the ratios have been changed or whatever cannot help ya there but what it was OEM yes--Comp

12-22-2010, 10:27 PM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,410 Likes: 507 Liked 329 Times in 177 Posts	Re: 12 Bolt GM ? Larry-348690 is the casting number for a 12 bolt case but look on the top of the passenger side tube more towards the front of the car and there are a series of letters& numbers stamped in the tube---ya probably will hafta wire brush the tube clean to find those numbers---give me all of the numbers/letters and I can tell ya most of what ya want to know as far as WHAT IT WAS FROM THE FACTORY---now if the ratios have been changed or whatever cannot help ya there but what it was OEM yes--Comp