Slipping or No Third Gear
Checks
| Cause
|
DEFINITION: A large engine RPM
increase is noted in third gear, Drive range, with little or no vehicle forward
speed increase. First, second, and fourth gear operation are normal. Shifts
into third gear are soft or do not occur. Third gear ratio is 1.000:1.
|
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. |
|
Control Valve Body Assembly
|
| • | The 2-3 shift valve (357) or the 3-2 manual downshift
valve (356) is stuck or binding. |
| • | Debris is found in the passages of the control valve body (301)
or of the control valve body spacer plate and gasket assembly (396) |
| • | The #4 or the #9 ball check valve is missing or mislocated. |
|
Driven Sprocket Support Assembly
| A plugged third clutch oil passage in the driven sprocket
support assembly (609)
|
Third Clutch Assembly
|
| • | Input clutch housing oil seal rings (628) are missing or damaged. |
| • | The third clutch ball check valve assembly (724) is missing or
damaged. |
| • | The third clutch piston (642) is damaged. |
| • | The third clutch piston inner seal (641) is missing or damaged. |
| • | The third clutch plates (645-648) are worn or misassembled. |
|
Third Clutch Sprag Assembly
|
| • | The sprag (720) was misassembled or backwards on the inner race
(661). |
| • | A damaged third clutch sprag assembly (653, 661, 719-721) |
|
