Geartrain
Geartrain
Power is transmitted from the torque converter to the geartrain components through the input shaft and forward clutch cylinder.
- By holding or driving certain members of the gearset, 5 forward ratios and one reverse ratio are obtained and transmitted to the output shaft. The ratios are as follows:
a Special operating strategy is enabled when transmission temperature is less than -15°C (5°F)
Input Shaft
The input shaft is supported by 2 bushings in the stator support. End positioning of the input shaft is controlled by the splines in the converter turbine and the Overdrive (O/D) planet assembly.
Output Shaft
The output shaft is supported by a press fit radial bearing in the extension housing. It is positioned by a bushing in the forward clutch cylinder, which in turn is positioned by the case center support and the center shaft.
Overdrive (O/D) and Coast Clutch System
The O/D and coast clutch system consists of the following:
- O/D friction clutch assembly
- Coast clutch cylinder
- O/D sun gear
- Coast clutch input hub
- Coast clutch friction clutch assembly
- O/D planetary
- O/D ring gear
- Center shaft
The O/D clutch piston has bonded lip seals. It is installed into the piston bore, cast into the pump and held in place by the return spring. The return spring is attached to the pump with 3 bolts. The O/D clutch separator plates and pressure plate are splined to the case. The 3 O/D friction plates are splined to the coast clutch cylinder. The O/D clutch assembly is positioned between the pump face and a snap ring, and installed into the case adjacent to the O/D pressure plate. The O/D sun gear is pressed into the coast clutch cylinder.
The coast clutch piston is also a bonded lip seal type. The coast clutch piston is installed into the coast clutch cylinder and held to the cylinder along with the clutch return spring by a snap ring. The separator plates are splined to the case.
The coast clutch pressure plate is a mechanical diode One-Way Clutch (OWC) assembly. The OWC is splined to the coast clutch cylinder and held in with a snap ring. The coast clutch friction plates are internally splined to the coast clutch hub, which is held to the O/D carrier by 4 bolts. Absorbing the load between the O/D carrier and the O/D sun gear is the "captured" thrust bearing, part of the O/D planet assembly.
On the opposite side of the O/D planet is a thrust bearing positioned between the carrier and the shaft. The O/D ring gear is splined to the center shaft and retained by a snap ring. On the opposite side of the center shaft is a thrust bearing that separates it from the center support. The O/D coast clutch system is driven clockwise by the input shaft, one end of which is splined to the torque converter cover, and the other end is splined to the O/D carrier.
Center Support and Intermediate Clutch
The center support is rigidly held to the case by a tapered snap ring. The flat side faces toward the center support and the gap at 6 o'clock. The center support is also retained to the case by 2 hollow feed bolts. Both the forward clutch feed bolt and the intermediate clutch feed bolt are installed through the solenoid body worm trail of the case. The forward feed bolt has an orifice plug installed on top of the bolt head.
The center support acts as the intermediate clutch cylinder piston bore, and also provides the snap ring groove to retain the bonded seal type intermediate clutch piston and the return spring. A black phenolic thrust washer is positioned by its 2 tabs into 2 holes in the center support. A seal pack containing 2 Teflon(R) seals is pressed onto the center support hub below a pressed-on steel sleeve. The sleeve acts as the journal for the direct clutch cylinder bushings.
The intermediate clutch separator plates and pressure plate are externally splined to the case and the friction is internally splined to the direct clutch cylinder. The case and the center support define and limit the stroke of the intermediate clutch.
Forward Drive System
The forward drive system consists of the following:
- Direct clutch assembly
- Forward clutch assembly
- Forward ring gear
- Forward planetary assembly
- Forward/reverse input shell assembly
The direct clutch grobbed cylinder contains the following:
- A bonded lip seal piston
- A direct clutch return spring
- A direct clutch bonded lip seal balance piston
These components are held in place by a snap ring to the direct clutch cylinder.
The direct clutch separator plates and pressure plate are splined to the direct clutch cylinder and held by a snap ring. The direct clutch friction internally splined plates mate with the grobbed splines on the forward clutch cylinder. The forward clutch has a bonded lip seal piston, a beveled design return spring and a bonded lip seal balance piston which are held to the cylinder with a snap ring.
The forward clutch cushion wave spring is splined to the cylinder, as are the separator plates and pressure plate and are held together with a selective snap ring. The forward clutch friction plate is splined to the forward ring gear.
Positioned on the center support hub is a thrust bearing to locate the forward clutch cylinder. There is a thrust bearing positioned between the direct clutch cylinder and the forward clutch cylinder. There is also a thrust bearing positioned between the forward clutch cylinder and the forward ring gear; and between the forward planet and the forward clutch cylinder. There is a thrust washer separating the forward carrier from the forward ring gear hub. The 6 gear forward planet has a black, phenolic lube dam which snaps onto the rear of the carrier body. Into the center of the input shell is the forward/reverse sun gear positioned by a spacer and held in place by a retaining ring.
Low and Reverse Drive System
The low and reverse drive system consists of the following:
- Reverse side of the forward/reverse sun gear
- Reverse planet assembly
- Reverse ring gear and hub assembly
The reverse ring gear and output shaft hub assemblies are splined to the output shaft. The reverse bonded lip seal piston installs into the case. The return spring is held to the case by a snap ring.
The reverse separator plates are splined to the case, and the friction plates are splined to the reverse carrier. The pressure plate is combined with a rocker clutch, which is splined to the case and held in with a snap ring. There is a thrust bearing located between the case and the output shaft hub; and between the output shaft hub and the reverse sun gear. Located on both sides of the reverse carrier are white, phenolic thrust washers (4-tabbed).