All, Good article!  Couple of points / clarification to the guide.

Page 165 Dodge Ram Rear Axle - Mag says Dana 70 in 2500, Dana 80 in 3500.  True, with following correction, manual trans 2500 with the Cummins has the Dana 80, Auto has the Dana 70

My son's truck is a 97 2500 with NV4500 and the Dana 80, my truck is a 2002 2500 with 47Re and the Dana 70.

Page 165 GM C/K Series K10, K20 - says 8.875 inch 12 bolt rear in 82 to 84 K10, correction is that some K10's came with 12 bolt rear up to 87.  My K10 Silverado has the 12 bolt rear, with 3.73 and the 350 ci gas motor.

Thanks, Coolhand