Originally Posted by DarkSideofWill
The 3500 should have the 11.5" 14 bolt. The one I just bought does.
The 10.5" 14bff will have a ring of bolts around the pinion yoke, owing to having a separable pinion bearing carrier.
The 11.5" is used in 1 ton vehicles and does not have the separable pinion bearing carrier, which means there will not be a ring of bolts around the pinion yoke.
My 3500 van has the 10.5" 14 bolt GM has used forever with the bolt in pinion. I thought only the pickup trucks got the 11.5"