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4L80E tranny shifting weird Brandon 6-10-09  
1995 gmc 1ton dually 4x4 4l80e. shifts good through 1st 2nd and third. When it goes into 4th it chatters like it wants to go back into third. i put the petal to the floor and it comes out of it. i replaced the tcc switch and it went out of the system for about 100km then came back. Anyone got any ideas im at wits end. Almost ready to get rid of the engine and trans and drop a duramax in it and these problems be over!
Re: 4L80E tranny shifting weird jeff 6-15-09  
Hello Brandon.....i have a '87 suburban retrofitted with a 4L80E....after i had that tranny rebuilt, i had the same problem...I was told by the "experts" replace the tranny loom, replace the solenoids....i asked if it was possible that the TCU( transmission controller) was bad.....again the experts said NO.....a year went on with no good results and i was about to put back in a turbo 400, when i found another TCU and switched out the prom, with the new unit and replaced the old TCU with the new replacement and's been 8 months and no issues at's worth a shot
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