This section examines the transfer case.
This transfer case is bolted to the rear of the transmission. Drive is transmitted from a helical gear splined to the output shaft, through an idler, to the output shaft pinions.
They are free to rotate on needle roller bearings on the rear section of the output shaft. They have external dog teeth facing an engagement hub and sleeve, splined to the shaft.
When two-wheel drive, high range, is selected, the engagement sleeve engages the dog teeth of the smaller output pinion This locks the pinion to the shaft and provides a high-output speed range.
Drive is transmitted through the larger pinion of the idler gear and the locked output pinion. This rotates the rear section of the output shaft which is coupled to the rear final drive unit.
The idler gear pinion transfers the drive from one shaft to the other and has no effect on the ratio.
For four-wheel-drive, high-range splines on the rear section of the output shaft are also engaged by a separate engagement sleeve, splined to the front section.
This locks front and rear sections together, providing a high-output speed to all four wheels.
For four-wheel-drive, low-range, the transfer case engagement sleeve engages the larger output pinion. At the same time, the four-wheel-drive engagement sleeve locks into position.
Drive is transmitted from the transmission output to the large idler pinion, through the smaller idler pinion, to the larger. locked, output pinion.
This double reduction in the gear ratio provides a low output speed range to both front and rear wheels.
With the engagement sleeve in a central or neutral position, the main transmission can drive an accesory like a cable winch. The idler gear and output pinions rotate, but no drive is transmitted to the output shaft.
