#2  
Old 01-01-2010, 11:12 AM
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howler4x4
howler4x4 is offline
More Turbo
Join Date: Jan 2009
Location: LI, NY
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Post the info from the tag on the diff
or
search here for VIN # decode info

Both of the above assume that the ratio is still matches the tag/VIN. 100% sure method is to count teeth; prolly overkill for your purpose.