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Click on image for the lowdown. 
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| | | Forums66 Topics128,072 Posts1,055,903 Members48,429 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#66026 09/19/2006 4:03 PM | Joined: Apr 2002 Posts: 17 Junior Member | | Junior Member Joined: Apr 2002 Posts: 17 | I have a GM casting number of 3707306, which seems to be mid 50's passenger car other than Chevy. Can anyone tell me what it is? It has a 3.7:1 ratio. I plan on changing the ratio and bearing. | | |
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