The gear input shaft (A) is splined to the range sliding gear (B). The range sliding gear is shifted forward or rearward with the range shift fork, controlled by the range shift lever. The sliding gear contains a spring and ball which holds the gear in one of three detent positions; forward – high range, middle – neutral, and rearward – low range.
The sliding gear is a double gear with that engages with the range output gear. The range output gear is also a double gear and is splined to the bevel gear.
When the sliding gear is shifted forward its larger gear engages the smaller gear (C) on the range output gear causing the range output gear to rotate at a higher rpm An internal ball and spring in the shift fork holds the range sliding gear in the forward detent position.
When the sliding gear is shifted rearward it moves into a neutral position where the range sliding gears are between the gears of the range output gear. No gears are engaged and the transmission is in neural. The shift fork can maintain that position with the detent ball.
When the sliding gear is shifted rearward its smaller gear engages the larger gear (D) of the range output gear causing the range output gear to rotate at a lower rpm. The internal ball and spring in the shift fork again hold the range sliding gear in a detent position.
When the range output gear is being driven it rotates the splined pinion gear (E) which is engaged to the bevel gear (F). This turns the axis of rotation 90 degrees. The final drive pinion shaft is splined to the inside of the bevel gear and engaged to the final drive ring gear.
Whenever the pinion gear is being driven the bevel gear, final drive pinion shaft, final drive ring gear, differential, and rear axles rotates.