Drive Range-Fourth Gear

Drive Range - Fourth Gear:

DRIVE RANGE-FOURTH GEAR

CONVERTER CLUTCH APPLIED
FOURTH CLUTCH APPLIED
THIRD CLUTCH APPLIED

The 3-4 shift is basically controlled in the same manner as the 2-3 shift. As vehicle speed increases, governor pressure overcomes 3-4 Modulated Throttle Valve (M.T.V.) and 3-4 throttle valve spring pressure to open the 3-4 shift valve. The 3-4 shift valve then allows third pressure to fill the fourth clutch passage which is directed to the following:

Fourth Clutch Check Ball (1): Orifices the feed to the fourth clutch.

3-4 Accumulator: Cushions the fourth clutch apply by absorbing fourth clutch oil. The amount of cushion is controlled by the accumulator pressure.

Fourth Clutch Piston: Applies the fourth clutch.

SUMMARY
The fourth clutch holds the input sun gear; the second clutch drives the input carrier around the stationary sun gear; and the input internal gear is driven in Overdrive.