They are all HD D44s front and rear on the Gladiator. The axles on the Max Tow, Rubicon, Mojave and High Altitude are all 1.5” wider than the Sport, Sport S, and Overland.
@Jeep or Tacoma is right; there is a 6-speed manual and 8-speed auto for the gasser. The diesel has a different 8-speed...