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FED 387 · 12-23-2010, 07:23 PM

larry there will be a code something like
2 letters --then
4 numbers--then
2 or 3 letters

This is just an example but it will look something like this
QY 01 01 GE

Give me that code and I can tell ya what it was ORIGINALLY

Also any other numbers cast into the cast iron housing look along the ridges that is usually where they put them---that 3894860 is a 12 bolt cast iron center but without the other codes ya quite cannot tell what the housing is/was GM had different widths from model to model as well as year to year

12-23-2010, 07:23 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 Liked 333 Times in 180 Posts	Re: 12 Bolt GM ? larry there will be a code something like 2 letters --then 4 numbers--then 2 or 3 letters This is just an example but it will look something like this QY 01 01 GE Give me that code and I can tell ya what it was ORIGINALLY Also any other numbers cast into the cast iron housing look along the ridges that is usually where they put them---that 3894860 is a 12 bolt cast iron center but without the other codes ya quite cannot tell what the housing is/was GM had different widths from model to model as well as year to year