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Buick Forum: New Member
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Thread: New Member

  1. #1
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    New Member

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    Hi, my name is Gary, i'm a newbie ! I just purchased a 65? Buick Skylark rear end housing. I'm trying to find the information about it with these casting codes:

    1. 2A2
    2. CFD2
    3. 1369629

    I was told it is from a Skylark Wgn. Can anybody lead me to a site that can decipher these #'s

    Thanks, Gary

  2. #2
    LARRY70GS's Avatar
    LARRY70GS is offline Full Member My Buick(s): 98 Riviera, 70 GS455 Stg1
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    Re: New Member

    Quote Originally Posted by troyboyone View Post
    Hi, my name is Gary, i'm a newbie ! I just purchased a 65? Buick Skylark rear end housing. I'm trying to find the information about it with these casting codes:

    1. 2A2
    2. CFD2
    3. 1369629

    I was told it is from a Skylark Wgn. Can anybody lead me to a site that can decipher these #'s

    Thanks, Gary
    The 1965 standard rear end was the BOP 8.2 10 bolt. It's a good rear with bolt in axles, and lots of aftermarket support. On the driver's side axle tube, there should be a 2 letter code and numbered build date. That will tell you what gears it originally came with. Another way to find out the gear ratio is to remove the rear cover and rotate the ring gear. Stamped into the ring gear will be, among other markings, 2 numbers. If you divide the smaller number into the larger, it will tell you the ratio. Something like 42-13, that would be 3.23

    I encourage you to visit www.v8buick.com and join. That will hands down be the best site for the 60's and 70's Buick cars. We have a member, Jim Mitchke (screen name Monzaz), who is our rear specialist. His site, www.jdrace.com also has a Forum for rear axle questions.

    Below is a chart that shows the ID codes. Should be stamped into the axle tube. You may need to wire brush or clean the area to see.
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    Larry
    1970 GS455 Stage1, 4080 lbs Race Weight, Best ET, [email protected], Best MPH, 11.58@ 115.89 MPH
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  3. #3
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    Re: New Member

    Quote Originally Posted by LARRY70GS View Post
    The 1965 standard rear end was the BOP 8.2 10 bolt. It's a good rear with bolt in axles, and lots of aftermarket support. On the driver's side axle tube, there should be a 2 letter code and numbered build date. That will tell you what gears it originally came with. Another way to find out the gear ratio is to remove the rear cover and rotate the ring gear. Stamped into the ring gear will be, among other markings, 2 numbers. If you divide the smaller number into the larger, it will tell you the ratio. Something like 42-13, that would be 3.23

    I encourage you to visit www.v8buick.com and join. That will hands down be the best site for the 60's and 70's Buick cars. We have a member, Jim Mitchke (screen name Monzaz), who is our rear specialist. His site, www.jdrace.com also has a Forum for rear axle questions.

    Below is a chart that shows the ID codes. Should be stamped into the axle tube. You may need to wire brush or clean the area to see.
    Larry, Thanks for the reply. I have checked the ring gear..it's 37-12=3.08 ratio. I want to determine mfg. date & what vehicle it came from. Will the 3rd # tell me the vehicle. I will check the driver side tube for the date. Thanks

  4. #4
    LARRY70GS's Avatar
    LARRY70GS is offline Full Member My Buick(s): 98 Riviera, 70 GS455 Stg1
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    Re: New Member

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    I doubt it. You'll need to carefully look at the braking components and bearings to be sure where it came from. The guys over at V8 can help. It's 50 year old stuff.

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