The 14-bolt has a 10 1/2-inch ring gear and a pinion gear sporting a 1.590-inch shank. There is a case split between 4.10 and 4.56, so you'll have to get a new differential if changing a 4.10 gear ...

TMR Customs complete “15-Bolt” shave kit for the GM Corporate 14-Bolt (14b) differential housing consists of fabricated steel cover with TMR logo, stainless steel bolts and cap plate.