I personally rebuilt the transmission in my 2002 Ford Explorer. I had the bore sleeves installed a transmission shop. Put about 8,000 miles of which was perfect, smooth shifting. This last weekend I notice a long shift between 1-2 and it started throwing codes P0732, P0735, and P0775. P0775 has to do with the OD Servo having low pressure due to a worn out servo bore from the servo pin. Can't believe that the new bushings are worn out after 8,000 miles. Any one have this experience?

 

If replaced the valve body with a upgraded re-manufactured valve body. Didn't work. Still getting P0775. Getting a 1-2 shift flare, 2-3 shift is fine, 3-4 shift is fine, 4-5 shift is fine. Torque Converter Clutch does not engage. My understanding is that with a P0775, the code doesn't let the TCC engage. Everything is pointing to the O/D Servo. When I rebuilt the transmission, the O/D Servo was bad. I bought a used O/D Servo from a Transmission shop that looked good and he replace the servo bores with brass sleeves for me. I readjusted the band before replacing the valve body. Any transmission guys seen the brass sleeve in the OD Servo bore go bad or possibly the servo cup leaking or cracked? All I can think of I've haven't changed

This is killing me!

 

Why would you take the time and effort to rebuild this tranny and install used parts. Every time I tried that it bit me square in the butt. You get to go back in and try again.

 

What would be a good diagnostic procedure to follow and what equipment would I need?

Help would be greatly appreciated. Critiquing is not help.

 

Either air check the overdrive servo with the valve body off or just remove the servo and inspect it.

 

Well....If have the transmission all buttoned up and back together.
Here is a summary of what I have done:

I rebuilt this transmission 10,000 miles ago and am now getting the P0755, P0732, P0735 codes. When I rebuilt the transmission, I took it to a locale transmission shop and he added the servo sleeves to the servo bores.

I replaced the valve body with a upgraded re-manufactured valve body and replaced the OD servo with a new one from the Ford dealership.


With PCM connector disconnected and F-37 fuse pulled, ohms checked out okay on all the 4 shift solenoids (23.4@16-45 ohms), the 3 Pressure control solenoids check out at 5.2 ohms@3.3-7.5), TCC solenoid checks out at 10.3 ohms@9-16 ohms. All 3 speed sensors check out fine. Note: All of this was tested through the PCM to Transmission Case Connector wiring harness. Basically the same ohm check with the solenoid block out. I bench tested the solenoid block and rebuilt. Checks out fine. Turbine Speed Sensor, Output Speed Sensor, and Intermediate Speed Sensor all check out within OHM range through the wiring harness and bench testing.
With the ignition in Start position, I grounded each pin and listen to each solenoid. All solenoids energized by the sound of clicking, including the PC Solenoid "B", the one I am having trouble with.


Removed Valve Body, Reverse Servo, and Solenoid block again. Air checked the OD Servo band through the 4th Band Apply port and made sure that air was expelled through the 4th Band Release port. Checked out fine, no blockage.with band movement. Air checked the Intermediate Servo band through the 2nd Band Apply port and made sure that air was expelled through the 2nd Band Release port. Band was engage just the same as OD band.

Test drove the vehicle for 10 plus miles. Still not shifting into 2nd and 5th gear. Test drove later that day and all of a sudden it was shifting into 2nd and 5th gear perfect. When I came to a stop, sometimes it would shift into 2nd and sometimes not. Next day it was actually shifting into 2nd and 5th more frequently. MORE NOT SHIFTING CORRECTLY, THAN SHIFTING CORRECTLY.

Looks like to me, that the problem is not mechanical. Replaced Valve Body, rebuilt Solenoid Block and bench tested, Tested Solenoid block through wiring harness. Problem seems to lie in the wiring, inputs, or maybe PCM. Maybe semi broken strands on the pin 1 wire of the Pressure Control Solenoid "B" to pin 13 of the PCM connector.(Light Blue/Pink)

I have researched other places on this forum that had the same symptoms. They replaced everything I did. Anyone find that problem to this intermittent shifting problem I have??????