Re: axle ID help
If you have a Allison or ZF S6-650 trans.....You have a 11.5" AAM diff.
If you have a 4L80E or a NV4500.....You have a 10.5" 14-bolt (Corporate).
As for identifying U-joint by the axle doesn't sound right to me, I have a 11.5" AAM in my truck, But uses standard Spicer U-joints Not the odd ball AAM joints.
Measure the joints to be sure!
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