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Old August 5th, 2016, 10:27 AM
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Help ID rear gears
I'm hoping someone can identify these numbers of my rear diff gear. The code on the axle is S7. on my 69 442
Thanks
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Last edited by My2nd 69 442; August 5th, 2016 at 10:30 AM. Reason: add info
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Old August 5th, 2016, 11:50 AM
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same but different
 
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If you divide 13 into 42 you get 3.23 If its a posi carrier, it should be #671.

It looks factory to me, but I'm not expert.
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Old August 5th, 2016, 12:24 PM
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Randy C.
 
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And, of course, S7 is the code for a 3.23:1 anti-spin differential with disc brakes.

Randy C.
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Old August 5th, 2016, 12:53 PM
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Thanks guys.. That's what it was advertised to be. I had no idea that the 1st set of numbers would tell me the ratio.
I'm learning more everyday,and that isn't easy for this old fart.
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Old August 5th, 2016, 01:04 PM
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same but different
 
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I hear you Jerry, as long as we are learning more than we are forgetting, we're doing OK.

Also, if you care to know this axle has 28 splines on the shafts.
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Old August 5th, 2016, 01:28 PM
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Once again Thanks Don and Randy. By the black marks left on the road It is for sure anti-spin and it does have front Disc brakes.
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