Slipping or No First Gear
Checks
| Cause
|
DEFINITION: A large engine RPM
increase is noted in first gear, Drive range, with little or no vehicle forward
speed increase. Second, third, and fourth gear operation are normal. Shifts
into first gear are soft or do not occur. First gear ratio is 2.921:1.
|
Automatic
Transmission Fluid Level
| Low fluid level
|
Transmission Main Line Pressure
| Low transmission main line pressure
|
Oil Filter
Assembly
|
| • | The oil filter assembly (100) is missing, plugged, or damaged. |
| • | The oil filter seal assembly (101) is missing or is damaged. |
|
Accumulator and Manual 2-1 Band Servo Assembly
|
| • | A loose or damaged forward band servo oil pipe (124) |
| • | Loose manual 2-1 band servo cover of accumulator cover bolts
(103, 131) |
| • | A missing or a damaged manual 2-1 servo cover gasket (105) |
| • | A damaged accumulator cover spacer plate assembly (134) |
|
Forward Band Servo Assembly
|
| • | The servo piston oil seal ring (18) is missing or damaged. |
| • | The servo piston (16) is damaged or stuck in the servo cover (13). |
| • | The servo piston cushion spring (19) or the retainer (20) is missing
or damaged. |
| • | The servo piston pin (21) is not engaged to the forward band assembly
(688). |
| • | The forward band assembly (688) is worn or burned. |
| • | The forward band assembly (688) is disengaged from the anchor
pin (117A). |
| • | The band anchor pin (117A) is loose or missing. |
|
Control Valve Body Assembly
|
| • | The 1-2 shift valve (318) is stuck or binding. |
| • | The #3 ball check valve (372) is missing. |
|
Input
Clutch Assembly
|
| • | The input clutch sprag assembly (722) is damaged or misassembled. |
| • | The input clutch housing oil seal rings (628) are missing or damaged. |
| • | The input clutch housing ball check valve assembly (633) is missing
or damaged. |
| • | The input clutch piston inner/outer seals (634/635) are missing
or damaged. |
| • | The input clutch piston (636) is damaged. |
| • | The input clutch plates (645-658) are worn. |
|
1-2 Clutch Roller Assembly
| The 1-2 clutch roller assembly (683) is damaged.
|
