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Information on 4T40-E (MN4) and 4T45-E (MN5) Front Wheel Drive Automatic Transmission Valve Body Reconditioning DTC P0741, P0742, P0751, P0752, P0756, P0757, P1811, Harsh Shift, Slip, No Drive/Reverse

Subject:Information On 4T40-E (MN4) and 4T45-E (MN5) Front Wheel Drive Automatic Transmission Valve Body Reconditioning, DTC P0741, P0742, P0751, P0752, P0756, P0757, P1811, Harsh Shifts, Slips, No Drive, No Reverse

Models:1997-2005 Chevrolet Cavalier
1997-2007 Chevrolet Malibu
2005-2007 Chevrolet Cobalt
2006-2007 Chevrolet Malibu Maxx, HHR
1997-1998 Oldsmobile Cutlass
1999-2004 Oldsmobile Alero
1997-2005 Pontiac Sunfire
1999-2005 Pontiac Grand Am
2005-2006 Pontiac Pursuit (Canada Only)
2005-2007 Pontiac G6
2007 Pontiac G5
2000-2005 Saturn L-Series
2005-2007 Saturn ION, VUE
2007 Saturn Aura
with Hydra-Matic® 4T40-E (RPO MN4) and 4T45-E (RPO MN5) Automatic Transmission



The following new service information outlined in this bulletin will aid technicians in providing easy to follow valve body reconditioning instructions and new illustrations to simplify reassembly of the valve body. The service bulletin will also provide additional service information documents that are related to the 4L6x transmission family.

Related Service Documents

    • PIP 3253B - No Move Drive or Reverse
    • 02-07-30-039F - Firm Transmission Shifts
    • 02-07-30-050 - Engineering Change Valve Body

Important: If valve body cleaning is not required, Do Not disassembly bores unless it is necessary to verify movement of valves.

Inspection Procedure

  1. Using the exploded views in this bulletin, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer’s concern.
  2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores.
  3. If a valve is restricted and cannot be corrected by cleaning valve and bore, then replace valve body. Describe restricted valve on repair order.

Valve Body Spring and Bore Plug Chart (Metric)


Object Number: 2013661  Size: FP

 

Valve Body Spring and Bore Plug Chart (Inch)


Object Number: 1999013  Size: FP

 


Object Number: 1999011  Size: FP

Left Side Control Valve Body Assembly

 

Call Out Number

Description

301

Spring, 1-2 Shift Valve

302

Valve, 1-2 Shift

304

Retainer Clip

305

Solenoid with O-Ring, 1-2 Shift

Solenoid with O-Ring, 2-3 Shift

306

Spring, 2-3 Shift Valve

307

Valve, 2-3 Shift

308

Spring, Torque Signal Regulator

309

Valve, Torque Signal Regulator

312

Solenoid, Pressure Control with Two O-Rings and Screen

314

Filter, Actuator Oil

315

Valve, Actuator Feed Limit

316

Spring, Actuator Feed Limit

317

Plug, Bore

318

Spring, 3-4 Shift Valve

319

Valve, 3-4 Shift

321

Plug, Bore with O-Ring


Object Number: 1999012  Size: FP

Right Side Control Valve Body Assembly

 

Call Out Number

Description

304

Retainer Clip

317

Plug, Bore

323

Valve, Accumulator

324

Bushing

325

Valve, Pressure Regulator Boost

326

Spring, Isolator

327

Spring, Pressure Regulator Valve

328

Valve, Pressure Regulator

329

Spring, 2-3 Accumulator Valve

330

Valve, 2-3 Accumulator

331

Spring, TCC Feed Limit

332

Valve, TCC Feed Limit

333

Spring, TCC Control Valve

334

Valve, TCC Control

335

Solenoid, TCC with Two O-rings

339

Valve, TCC Regulated Apply

340

Spring, TCC Regulated Apply Valve

341

Plug, Bore

Notice: Be sure all solenoids are installed with the electrical connectors facing the non-machined (cast) side of the valve body; otherwise, the solenoids will bind against the transmission case as the valve body bolts are tightened and damage may occur.

Disassembly/Reassembly

  1. If a valve is restricted by a metal burr from machining that bore, remove valve and burr, then inspect movement in the valve’s normal position. If no other debris or restrictions are found, then reassemble valve body and install in the transmission.
  2. If the valve body has been contaminated with debris from another transmission component failure, then disassemble all bores for complete cleaning of all valve body components. If possible keep individual bore parts separated for ease of reassembly. Use the following illustrations in this bulletin for a positive identification and location of individual parts:
  3. • Left Side Control Valve Body Assembly
    • Right Side Control Valve Body Assembly
    • Control Valve Body Assembly Chart, Valve Springs and Bore Plugs
  4. Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan) clean the valve body and dry it with compressed air. Use appropriate eye protection.
  5. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore.