The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

clinebarger · 07-08-2014, 07:11 PM

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!

07-08-2014, 07:11 PM	#6
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	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!