VALVE BODY & INTERMEDIATE BAND SERVO
Note. As valve body is disassembled, place individual parts in correct order and relation to valve body for reassembly. Tag all springs as they are removed.
No Forward Engagement
Fluid level, shift linkage or cable, low line pressure, pump inlet filter and seal assembly, stuck manual valve, valve body leakage (gasket damage), improperly torqued valve body bolts, forward clutch assembly (damaged stator support, damaged check ball, loose feed bolt, damaged center support, worn clutch components), forward/reverse sun gear damaged, front planetary assembly damaged, output shaft splines and low one-way clutch assembly.
No Reverse Engagement
Fluid level, shift linkage or cable, low line pressure, pump inlet filter and seal assembly, stuck manual valve, valve body leakage (gasket damage), improperly torqued valve body bolts, coast clutch assembly, direct clutch assembly (only if 3rd gear is also inoperative), forward planetary assembly, reverse clutch assembly, reverse planet assembly and reverse ring gear.
Harsh Reverse Engagement
High line pressure, valve body leakage (gasket damage), improperly torqued valve body bolts, Electronic Pressure Control (EPC) solenoid stuck, stuck valve body components (direct clutch accumulator valve and plunger, engagement control valve, direct clutch accumulator regulator valve, springs), pump assembly and direct clutch assembly.
Harsh Forward Engagement
High line pressure, valve body leakage (gasket damage), improperly torqued valve body bolts, Electronic Pressure Control (EPC) solenoid stuck, valve body check ball No. 13 missing, pump assembly, direct clutch assembly and forward clutch assembly.
Delayed/Soft Reverse Engagement
Shift linkage or cable, improperly torqued valve body bolts, valve body components (direct clutch accumulator regulator valve, low reverse modulator valve, springs), coast clutch assembly, direct clutch assembly and reverse clutch assembly.
Delayed/Soft Forward Engagement
Fluid level, shift linkage or cable, low line pressure, pump inlet filter or seal assembly, improperly torqued valve body bolts, center support assembly and forward clutch assembly.
No Forward & No Reverse Engagement
Fluid level, internal or external shift linkage, low line pressure, pump inlet filter and seal assembly, manual valve, valve body leakage (improperly torqued bolts), pump assembly (main regulator/booster valve), center support assembly, forward/reverse sun gear, forward planetary assembly, input shaft, center shaft, output shaft, overdrive carrier assembly and overdrive overrunning clutch (shift selector in OD with OD switch in cancel mode).
Harsh Forward & Reverse Engagement
High line pressure, valve body bolts improperly torque, EPC solenoid stuck, valve body components (engagement control valve) and pump assembly (main regulator/booster valve).
Delayed/Soft Forward & Reverse Engagement
Shift linkage or cable, fluid level, low line pressure, pump inlet filter and seal assembly, valve body bolts improperly torqued (gasket damage) and torque converter drainback (initial engagement only).
No Shifting
Fluid level, internal or external shift linkage, pump inlet filter/seal assembly and valve body components.
Early/Late Shift Timing
Incorrect tire size, incorrect speedometer gear, mismatched axle ratio, poor engine performance and valve body components.
Erratic or Hunting Shift Timing
Fluid level, pump inlet filter and seal assembly, valve body components and torque converter clutch.
Soft or Slipping Shift Feel
Fluid level, low line pressure, valve body bolts improperly torqued (gasket damage, leaks), EPC solenoid, valve body components (line modulator valve, accumulator assembly) and pump assembly.
Harsh Shift Feel
Fluid level, high line pressure, valve body bolts improperly torqued (gasket damage), EPC solenoid, accumulator assembly, valve body components (line modulator valve) and pump assembly.
No 1st Gear, Engages In Higher Gear
Internal or external shift linkage, valve body bolts improperly torqued (gasket damage), shift solenoid 1 and/or 2, valve body components (solenoid regulator valve, 2-3 shift valve, 3-4 shift valve, D2 valve), air bleeds for S1 or S2 circuits missing, damaged band servo or clutches, reverse ring gear and low/reverse one-way clutch.
No Low (Manual 1st) Gear
Internal or external shift linkage, valve body bolts improperly torqued (gasket damage), shift solenoid No. 1, valve body components (manual control valve, low reverse modulator valve, 1-2 shift valve, 2-3 shift valve, BS1 check ball, 4-3-2 timing valve) and low/reverse one-way clutch assembly.
No 2nd (Manual 2nd) Gear
Internal or external shift linkage, improperly torque valve body bolts, valve body components (2-3 shift valve, 3-4 shift valve, manual 1-2 transition valve, BS2 or BS6 check ball) and intermediate clutch assembly and intermediate one-way clutch assembly.
No 1st To 2nd Shift
Internal or external shift linkage, improperly torque valve body bolts, valve body components (D2 valve, 1-2 shift valve, 1-2 manual transition valve, intermediate clutch accumulator regulator valves, springs), shift solenoid No. 2, intermediate clutch assembly and intermediate one-way clutch assembly.
No 2nd To 3rd Shift
Improperly torque valve body bolts, valve body components (2-3 shift valve, direct clutch accumulator regulator valves, springs), shift solenoid No. 1, direct clutch assembly and center support assembly.
No 3rd To 4th Shift
Improperly torqued valve body bolts (gasket damage), shift solenoid No. 1, shift solenoid No. 2, valve body components (overdrive accumulator regulator valve, 3-4 shift valve, overdrive one-way clutch assembly, overdrive clutch assembly and overdrive planetary assembly.
No 4th To 3rd Shift
Improperly torqued valve body bolts (gasket damaged), shift solenoid No. 2 and valve body components (check ball BS2, 3-4 shift valve).
No 3rd To 2nd Shift
Improperly torqued valve body bolts (gasket damaged), shift solenoid No. 1 and valve body components (3-2 shift valve).
No 2nd To 1st Shift
Improperly torqued valve body bolts (gasket damaged), shift solenoid No. 2 and valve body components (D2 shift valve).
Soft/Slipping 1st To 2nd Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (intermediate clutch accumulator regulator valve or plunger) and intermediate clutch assembly.
Soft/Slipping 2nd To 3rd Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (direct clutch accumulator regulator valve or plunger), center support assembly and direct clutch assembly.
Soft/Slipping 3rd To 4th Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (overdrive accumulator regulator valve and spring, overdrive accumulator plunger and springs) and overdrive clutch assembly.
Soft/Slipping Downshifts
Improperly torqued valve body bolts (gasket damaged) and valve body components (check ball CB7, damage valve body separator plate).
Harsh 1st To 2nd Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (intermediate clutch accumulator regulator valve or plunger springs) and intermediate clutch assembly.
Harsh 2nd To 3rd Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (direct clutch accumulator valve or plunger), center support assembly and direct clutch assembly.
Harsh 3rd To 4th Shift
Improperly torqued valve body bolts (gasket damaged), valve body components (overdrive accumulator regulator valve or plunger) and overdrive clutch assembly.
Harsh 4th To 3rd Shift
Improperly torqued valve body bolts (gasket damaged), check ball CB7 missing and separator plate damaged.
Harsh 3rd To 2nd Shift
Improperly torqued valve body bolts (gasket damaged), check ball CB6 missing and separator plate damaged.
Harsh 2nd To 1st Shift
Improperly torqued valve body bolts (gasket damaged), check ball CB14 missing and separator plate damaged.
No Park Range
Misadjusted internal or external shift linkage, park mechanism components and transfer case and linkages (4WD).
Transmission Overheating
Fluid level and condition, transmission cooling system, poor engine performance and torque converter clutch.
No Engine Braking In Manual 2nd Gear
Improperly torqued valve body bolts (gasket damaged), check balls BS1, BS2, BS6 and CB1 missing or damaged, valve body separator plate, valve body components (4-3-2 timing valve, D2 valve, 2-3 shift valve, coast clutch shift valve, 1-2 manual transition valve, 3-4 shift valve), coast clutch assembly and intermediate servo/band assembly.
No Engine Braking In Manual 1st Gear
Improperly torqued valve body bolts (gasket damaged), check balls BS1 and CB1 missing or damaged, valve body components (3-4 shift valve, low reverse clutch modulator valve, D2 valve, 4-3-2 timing valve, 2-3 shift valve, coast clutch shift valve), valve body separator plate, coast clutch assembly and low reverse clutch assembly.
No Engine Braking With Overdrive Switch Cancelled (Manual 1st & Manual 2nd Have Engine Braking)
Improperly torqued valve body bolts (gasket damaged) and valve body components (coast clutch solenoid, check balls BS2 and BS3, separator plate, 3-4 shift valve).
High At Idle In All Ranges
Check main regulator valve, solenoid body and wiring harness.
Low At Idle In All Ranges
Check for low fluid level, restricted intake filter, loose main body, solenoid body or accumulator body-to-case bolts. Excessive leakage in pump, case control bodies, sticking main regulator valve or damaged inlet tube seal.
Low In "P" or "N"
Check valve body.
Low In "O/D"
Check forward clutch.
Low In "2"
Check forward clutch, intermediate clutch, coast clutch and servo.
Low In "1"
Check forward clutch, low-reverse clutch and/or coast clutch.
Low In "R"
Check coast clutch, low-reverse clutch and/or direct clutch.
Low In All Ranges
Poor engine performance. Faulty torque converter reactor one-way clutch.
High In All Ranges
General transmission problems are indicated. Perform control pressure tests.
High In "OD" Only
Forward clutch, overdrive one-way clutch or low-reverse one-way clutch faulty.
High In "2" Only
Forward clutch, or overdrive one-way clutch and coast clutch faulty.
High In "1" Only
Forward clutch, or reverse clutch and low-reverse one-way clutch, or coast clutch and overdrive one-way clutch faulty.
High In "R" Only
Direct clutch, or overdrive one-way clutch and coast clutch, or low-reverse clutch faulty.
AIR PRESSURE CHECKS
- A "No Drive" condition can exist, even with correct transmission fluid pressure, due to inoperative clutches or bands. Inoperative units can be located by substituting air pressure for fluid pressure to determine location of malfunction.
- To check unit, drain transmission fluid. Remove oil pan, filter, seal assembly, solenoid body and valve body.
- Forward, coast, reverse, overdrive, direct and intermediate clutch operation may be checked as follows: Using shop air, apply air to proper points. (Scheme 39) A dull thud can be heard when clutch piston is applied. If no thud is heard, movement of piston can be felt by placing finger tips on input shell. If seals are leaking, a hissing sound will be heard.
Scheme 39
TURBINE & STATOR END PLAY CHECK
- Insert Tester (T80L-7902-D) into converter pump drive hub until tester bottoms. Expand sleeve in turbine spline by tightening threaded inner post of tester until tester is securely locked into spine.
- Attach a dial indicator to tool with indicator button on converter pump drive hub. (Scheme 40) Zero dial face. Lift tool upward as far as possible and note indicator reading.
- Reading is total end play of turbine and stator. If end play exceeds.038" (.96 mm) on new or rebuilt converter, or.071" (1.8 mm) on used converter, replace torque converter assembly.
Scheme 40
CONVERTER ONE-WAY CLUTCH CHECK
- Insert One-Way Clutch Holding Tool (T77L-7902-R) in one of stator thrust washer grooves. Insert Converter Clutch Torquing Tool (T76L-7902-C) with torque wrench in converter pump drive hub to engage one-way clutch inner race. (Scheme 41)
- Hold holding tool stationary. Turn torque wrench counterclockwise. Converter one-way clutch should lock up and hold force of 10 ft. lbs. (13 N.m). One-way clutch should turn freely clockwise. Repeat procedure with holding tool in at least 5 locations. Replace converter if it fails testing.
Scheme 41
Stator-To-Impeller Interference Check
- Position stator support on bench with spline end of stator shaft pointing up. Mount converter on stator support so splines of one-way clutch inner race engage splines of stator support.
- While holding pump stationary, rotate converter counterclockwise. Converter should rotate freely without interference or scraping within assembly. Should interference or a scraping condition within converter exist or converter does not rotate freely, replace converter unit.
Stator-To-Turbine Interference Check
- Place converter on bench, front side down. Install stator support to engage mating splines of stator support shaft.
- Install input shaft, engaging splines with turbine hub. While holding stator shaft stationary, rotate turbine with input shaft.
- Turbine should rotate freely in both directions without interference or noise. If interference or noise exists, stator front thrust washer may be worn and converter should be replaced.
Note. Stator support may remain in pump assembly during check.