Drive Range, Eighth Gear (Mechanical Powerflow)

Note

The component callouts in the text refer to the component callout numbers in disassembled views. Disassembled Views To maximize engine performance and fuel economy, a 8th gear is used to achieve an approximate ratio of 0.854:1 through the transmission gearset to the vehicle drive shaft. This allows the vehicle to maintain a given road speed with less engine output speed. When the throttle is released in 8th Gear, the vehicle is allowed to coast brake. Because the low clutch roller assembly is not used in driving the vehicle during acceleration, there are no elements to overrun to allow the vehicle to coast freely. Therefore, engine compression slows the vehicle when the throttle is released until the transmission downshifts into 7th gear.

1. Power from Torque Converter The power flows through the turbine shaft to the input carrier (62) and 1-3-5-6-7-8-9 clutch assembly (554-565) which are both splined to the turbine shaft (568) and rotate at the same speed and direction.
2. Input Carrier Driving The power flows to the input carrier (62) which is splined to the turbine shaft (568) and rotates at the same speed and direction. Power flow continues through the input carrier pinion gears which are driving the direct overdrive sun gear shaft (65).
3. Direct Overdrive Sun Gear Shaft Driven The input internal gear (500) which is splined to the direct overdrive sun gear shaft (65) and rotates at the same speed and direction is driven by the input carrier (62) pinion gears.
4. Direct Overdrive Sun Gear Driving The direct overdrive sun gear (68) which is splined to the direct overdrive sun gear shaft (65) rotates at the same speed and direction.
5. Direct Overdrive Carrier Driven The direct overdrive carrier (67) is driven by the direct overdrive sun gear (68).
6. 1-2-3-4-6-7-8-10 Reverse Clutch Assembly Applied The 1-2-3-4-6-7-8-10 reverse clutch which is part of the triple clutch housing (66) is applied and holding the direct overdrive carrier (67) and rotates at the same speed and direction.
7. 4-5-6-7-8-9-10 Reverse Clutch Assembly Applied The 4-5-6-7-8-9-10 reverse clutch which is part of the triple clutch housing (66) is applied and holding the output carrier internal gear transfer shell (71) which is splined to the reaction carrier (55) and the output carrier internal gear (74), both rotate at the same speed and direction.
8. Output Carrier Internal Gear Transfer Shell The output carrier internal gear transfer shell (71) is held by the 4-5-6-7-8-9-10 reverse clutch which is part of the triple clutch housing (66). The output carrier internal gear transfer shell (71) rotates at the same speed and direction as the triple clutch housing (66).
9. Output Carrier Internal Gear Driving The output carrier internal gear (74) which is splined to the output carrier internal gear transfer shell (71) is driving the output carrier (38).
10. Output Carrier Driven Powerflow continues through the output sun gear (572). Which drives the output carrier (38) pinions to achieve the 8th gear starting ratio of approximately 0.854:1.
11. Output Sun Gear Driving The output sun gear (572) is driving the output carrier (38) pinion gears.
12. 1-3-5-6-7-8-9 Clutch Assembly Applied The 1-3-5-6-7-8-9 clutch assembly (554-565) is applied and holds the output sun gear (572).
13. 1-2-8-9-10 Reverse Clutch Assembly Applied The 1-2-8-9-10 reverse clutch assembly (414-420) is applied and holding the low clutch roller (421) which is splined to the reaction sun gear (572) and held stationary. Drive Range Eighth Gear

Drive Range, Eighth Gear (Mechanical Powerflow) — figure 1