4T40E/4T45E
Updates

The channel plate under went some changes for the 1997 model year. This change involved increasing the diameter of the channel plate sleeve from 1.103" (28.01mm) to 1.128" (28.65mm).

Driven Sprocket Support
The driven sprocket support was updated by adding a check ball capsule to the support assembly. The check ball capsule is to help control the 3-2 downshift release timing of the direct clutch.

Final Drive Torrington Bearing
The final drive Torrington bearing was updated on all units manufactured in May of 1998 or later. The new design bearing can be identified by it's color and size. The new bearing is "Silver" and the outside diameter is larger. The new bearing can be installed in previous design applications.

One Way Roller
An additional roller was added to the low roller clutch. The roller clutch outer cam was cracking, leading to failure of the roller clutch assembly. The updated roller clutch assembly can be installed in place of an assembly in previous year transaxles.

Forward Clutch Seal
Forward clutch inner seal update was made to reduce the engagement time for the forward clutch. The outside diameter of the inner seal was filled with bakelite, so the volume of fluid necessary to fill the clutch is less. The new design seal can be used in earlier model applications.

Input Carrier Pinion
The input carrier pinion diameter was changed to reduce spalling concerns with the pinion needle bearings. In addition, another needle bearing was added to the carrier assembly. This change first took place with the 4T45E and is compatible with the 4T40E.

Separator Plate
This change was designed to address hard downshifts into 2nd gear on 1996/97 models. The previous design plate used a slotted exhaust hole while the update design uses a round hole.

Wider Chain and Sprockets
A wider chain and sprockets were added to the 4T45E application to increase its torque capacity. These sprockets are not interchangeable.

TCC Solenoid Filter (#17)
The TCC solenoid filter (#17) in the spacer plate was removed in late 2001 and all 2002 applications. This was done because it was determined that the screen was not necessary as the TCC PWM solenoid already had a screen.

2-3 Accumulator Valve Train
The 2-3 accumulator valve train was eliminated from the valve body, there is no valve in this location.

Pressure Regulator Valve
The Pressure regulator valve was previously cross drilled. The updated valve body no longer uses a cross drilled pressure regulator valve. An updated spacer plate is required for the new valve body. The valve body was not designed to retrofit previous model transmissions.

2002 and later with new design PR valve and no 2-3 accumulator valve train use plate kit 24214699

1999-2001 with PR update included but with no changes to the 2-3 accumulator valve train use plate kit 24221953

2002 & Later	1999-2001

New Design PumpShaft
A new design pump shaft has been introduced for all models. The shaft change was done because of shaft sleeve breakage. The new design shaft will retrofit previous model transmissions.

1998 and earlier: Use plate kit 24205050 with the round hole design change