The ring-and-pinion sets shown for both the Model 20 (left) and the Dana 44 (middle) are 4.56s-note that the Model 20 pinion gear is massive compared to the 44 pinion gear. The ring gear for the 20 is also much thicker than the ring gear for the 44. As the gear ratios get numerically higher, the pinion gears get smaller. Compare the middle Dana 44 gearset with the 3.07 Dana set (right). Once the ratios for a 44 get into the 4.56:1 range, the pinion can become a weak point in the differential assembly.