i found this info on the LX forum hope this helps you.
Service Information
Valvebody
Part Numbers:
Issue Description:
Do not replace the entire Valvebody for an ISOLATED ELECTRICAL ISSUE such as solenoid, speed sensor, or temperature sensor. Also, do not replace the entire Valvebody due to damage of the 13 pin electrical connector. The leadframe itself P.N. 52108308AB contains all the circuitry, speed sensors, and temperature sensors and should be ordered and replaced preventing the unnecessary replacement of the entire Valvebody. In the event of a solenoid fault, you may also want to replace the specified solenoid.
There is a known issue with a 3-4 shift flare or Neutraling out on the 3-4 shift. In most cases this event is accompanied by a P0730, P1731, P0734, and/or P0733 Incorrect Gear Ratio codes. The cause of this event is ferrous or Aluminum debris in the 3-4 Shift Pressure and/or 3-4 Holding valves. Rather than replacing the VB;
1.) Remove the solenoids, leadframe assembly, and bolts securing upper to lower valvebody
2.) Lift upper housing off the VB and turn over. No need to clean the lower housing.
3.) Remove the steel endplate covering the all the 3-4 valves.
4.) Remove the 4 valves and flush out the bores and valves with a solvent such as mineral spirits. Contamination is known to be very small. Hold the housing vertically and flush the bore out generously. Flushing over filter paper (coffee filter) will allow you to observe the debris.
5.) Re-assemble the VB and re-install to roadtest.
6.) Only if the valves are still sticky after the flush or if the 3-4 shift issue persists, should the VB be replaced.
LOP 21-95-01-51 provides 1.2 hours for this repair.
The NAG transmission uses the wheel speed sensors to calculate transmission output shaft speed. If encountering gear ratio errors or late upshifts, please verify all four tires are of proper size as well as front and rear axle ratios. Mismatched tires can cause the module to think the vehicle is turning a corner, and thus delay an upshift. Numerous unnecessary transmission replacements have occurred due to a spare tire, aftermarket tire of incorrect size, incorrect axle, or incorrect gearset in proper axle.