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I could use some help. I rebuilt my 6l90 after i believe the torque converter failed. everything went good. all air checks and clearances. had to replace the pump/bell housing. rebuilt the techm pressure switches and cleaned all the metal out of everything also put in the upgraded frictions and steels, Sonnax zip kit, put it all back and the pressure looks great. but now i have 3 fault codes (p0989, P0872, P0877) Low voltage on the transmission fluid pressure switches 3, 4, and 5. Reverse seems to be delayed, as well as shifting from 1st to 2nd and 2nd to 3rd. 3456 seem fine. Any help will be greatly appreciated
 

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I would try Precision transmission in North Texas. Call them they should be able to answer your questions, also check them out on you tube.
 
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