An integrated drive generator comprising: a housing; and a differential gear system arranged within the housing, wherein the differential gear system comprises a planet gear system, a carrier, an input driven gear 10 coupled an input system and an output or ring gear, the ring gear is engagable with a driven gear on a generator, wherein the ring gear is coupled to the carrier that supports the planet gear system and a sun gear operably connected to a hydraulic system; wherein the planet gear system comprises a first planet gear, a second planet gear, and a third planet gear; wherein each of the first planet gear, the second planet gear and the third planet gear are similarly formed and include a planet gear body, the planet gear body includes an outer diametric edge and an inner diametric wall having a center; wherein each of the first planet gear, the second planet gear and the third planet gear comprises a root diameter or a diameter of planet gear body defined between base portions of opposing ones of outer gear teeth through center; wherein the carrier comprises the first planet gear support and the second planet gear support; wherein the first, second, and third planet gears are supported for rotation between the first and second planet gear supports (22, 23); each of the first, second, and third planet gears comprising: an outer diametric edge provided with 15 outer gear teeth; a first axle; a second axle that opposes the first axle; characterised in that at least one of the first and second axles (54, 55) including an outer diameter of between 1.174 cm 1.175 cm; wherein the first axle includes a first thrust shoulder having a first thrust surface and the second axle includes a second thrust shoulder having a second thrust surface, at least one of the first and second thrust surfaces including an outer diameter of between 1.430 cm and 1.455 cm; wherein the first and second thrust surfaces (68, 69) axially trap the corresponding planet gears between the first and second planet gear supports (22, 23); and wherein the first thrust surface is spaced from the second thrust surface by a distance of between 2.004 cm and 2.014 cm. a housing; and a differential gear system arranged within the housing, wherein the differential gear system comprises a planet gear system, a carrier, an input driven gear 10 coupled an input system and an output or ring gear, the ring gear is engagable with a driven gear on a generator, wherein the ring gear is coupled to the carrier that supports the planet gear system and a sun gear operably connected to a hydraulic system; wherein the planet gear system comprises a first planet gear, a second planet gear, and a third planet gear; wherein each of the first planet gear, the second planet gear and the third planet gear are similarly formed and include a planet gear body, the planet gear body includes an outer diametric edge and an inner diametric wall having a center; wherein each of the first planet gear, the second planet gear and the third planet gear comprises a root diameter or a diameter of planet gear body defined between base portions of opposing ones of outer gear teeth through center; wherein the carrier comprises the first planet gear support and the second planet gear support; wherein the first, second, and third planet gears are supported for rotation between the first and second planet gear supports (22, 23); each of the first, second, and third planet gears comprising: an outer diametric edge provided with 15 outer gear teeth; a first axle; a second axle that opposes the first axle; characterised in that at least one of the first and second axles (54, 55) including an outer diameter of between 1.174 cm 1.175 cm; wherein the first axle includes a first thrust shoulder having a first thrust surface and the second axle includes a second thrust shoulder having a second thrust surface, at least one of the first and second thrust surfaces including an outer diameter of between 1.430 cm and 1.455 cm; wherein the first and second thrust surfaces (68, 69) axially trap the corresponding planet gears between the first and second planet gear supports (22, 23); and wherein the first thrust surface is spaced from the second thrust surface by a distance of between 2.004 cm and 2.014 cm. an outer diametric edge provided with 15 outer gear teeth; a first axle; a second axle that opposes the first axle; characterised in that at least one of the first and second axles (54, 55) including an outer diameter of between 1.174 cm 1.175 cm; wherein the first axle includes a first thrust shoulder having a first thrust surface and the second axle includes a second thrust shoulder having a second thrust surface, at least one of the first and second thrust surfaces including an outer diameter of between 1.430 cm and 1.455 cm; wherein the first and second thrust surfaces (68, 69) axially trap the corresponding planet gears between the first and second planet gear supports (22, 23); and wherein the first thrust surface is spaced from the second thrust surface by a distance of between 2.004 cm and 2.014 cm.