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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. | | |
#66027 09/20/2006 2:39 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 |
Bill Burmeister
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#66028 09/20/2006 3:22 AM | Joined: Apr 2002 Posts: 17 Junior Member | | Junior Member Joined: Apr 2002 Posts: 17 | It might better to describe it. It is an open drive line, the axel has a five bolt pattern. The pumkin comes out the front and there is no rear bolted cover. The axels slide out with the help of a slide hammer. I just finished replacing the rear wheel bearings and resealing the differential. | | |
#66029 09/20/2006 4:13 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | That still doesn't narrow it down much, GM used similar desighn on their axles in the '50s, exept Buick, which stil used torque tube to the early '60s. If the center section is a some what oval shape, that would be a '55-'63 Chevrolet housing, Pontiac and Olds were more round. I do know that Chevy and Pontiac both offered 3.7 ratios.
Bill Burmeister
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#66030 09/20/2006 2:11 PM | Joined: Apr 2002 Posts: 17 Junior Member | | Junior Member Joined: Apr 2002 Posts: 17 | According to Patrick, the casting number does not match any Chevy, he thought Buick, Pontiac or Olds mid 50's. The center is round. And if Buick used torque tube until 60's. Maybe Pontiac mid fifties. The casting number is pre-60. I may have to try and match ring and pinion numbers when I pull the rear end apart. | | |
#66031 09/21/2006 3:23 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Starting to sound like Olds or Pontiac, next question would be how was the rear setup fpr suspension? Leaf or coil? Pontiac to '57 was leaf, coil in '58-up, Olds was the opposite. Either way, ring and pinions might be difficult to get, as these diffs haven't been made since the late '60s.
Bill Burmeister
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#66032 09/21/2006 5:45 AM | Joined: Apr 2002 Posts: 17 Junior Member | | Junior Member Joined: Apr 2002 Posts: 17 | Bill, thanks for the help.
It is hard to say how the suspension was originally set-up. This had been installed long before I bought this truck 7 years ago. It looks like someone had changed the brackets on the housing, it is now a leaf spring.
The axel must be shorter than the original truck, because I have had to install spacers to move the tires out.
My goal is to decrease the ratio since I use this as my daily driver. | | |
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