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Old 11-14-2011, 08:24 AM
Sierra02 Sierra02 is offline
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Ok, after putting the trans back together and verifying that the 3-4 clutch pack was installed correctly and checked the clearances. As well as air checking everything and recleaning of the transmission.

When I test drove the transmission was doing the same thing but this time throwing DTC P0757 (solenoid B stuck on). I did some research and found this:

Some customers may comment on any of the following conditions:
• An illuminated MIL where DTC P0757 is found as a history code in the PCM or TCM;
• No third and fourth gear;
• The transmission does not shift correctly;
• The transmission feels like it shifts to Neutral or a loss of drive occurs; and/or
• The vehicle free wheels above 30 mph. High rpm needed to overcome the free wheeling.
This condition may be caused by any of the following:
• Chips or debris plugging the bleed orifice of the 2-3 shift solenoid (367). This will cause the transmission to stay in second gear when third gear is commanded and return to first gear when fourth gear is commanded.

• A 2-3 shift valve (368) or 2-3 shuttle valve (369) that is stuck, restricted and/or hung-up in its bore.
This condition may also be an indication of a damaged 2-4 band or 3-4 clutches. This clutch damage may generate debris causing the 2-3 shift valve line-up to stick in the valve body bore and set DTC P0757.
1. Inspect the condition of the transmission fluid for signs of overheat or a burnt odor. If either is noted, the transmission should be disassembled for further investigation and repaired as needed.

See Figure 1.
2. Inspect the inside of the oil pan for signs of clutch friction material. A small amount of friction material in the bottom of the pan is normal. If a large amount of clutch material is noted in the fluid or bottom pan, the transmission should be disassembled for further investigation and repaired as needed.
3. Inspect and clean the 2-3 shift valve (368), the 2-3 shuttle valve (369) and the valve bore of debris/ metal chips.
4. Inspect and clean the 2-3 shift solenoid (367B) opening of debris/metal chips. While inspecting the 2-3 shift solenoid (367B), look for a screen over the solenoid opening. If the solenoid does not have a screen, replace the solenoid. All current GMSPO stock shift solenoids have a screen over the solenoid opening.
5. If clutch debris is found, it is also important to inspect the pressure control (PC) solenoid valve fluid screens. Clean or replace the PC solenoid as necessary. It is also important to flush and flow-check the transmission oil cooler using J 45096.

Refer to SI “Automatic Transmission Oil Cooler Flushing and Flow Test” for the procedure.
Just for **** and giggles I went ahead and replaced the solenoid and pulled the 2-3 shuttle valve out and cleaned the bore. Reinstalled the pan and test drove it only to have the same exact thing happen.

I have gone through the valve body with a took pick, the gaskets are the correct gaskets, all 7 check balls are in the correct locations. The forward accumulator is installed correctly.

I dont see how I could have burnt up the clutches on 3-4 with less than 5 miles on them. I also dont know what the hell is going on to stop it from shifting to third.

Video of the test ride after I got it all back together (before the solenoid replacement)
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