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4L80E no upshift Allen 1-24-11  
I rebuilt a 4L80E in a 2001 Chevy only shifts fine when I pull it down in 2nd and shift it manually will not work in 1st 3rd or OD only 2nd. I have been working on trans for over 30 years and I do not want to pull this big &^^%^$%#$ out again. Any insight thank you
Re: 4L80E no upshift john 1-26-11  
I Have a 93 Sierra 4x4 and the forward gears are gone.It only goes in reverse.
If anyone has any input or information about this problem please respond via e-mail or on the web page.
Re: 4L80E will not shift out of first gear Jay 8-30-11  
Changed filter & fluid. fluid was dark. i get all gears on collum but it wont shift out of first gear in drive. i also replaced shift seloniods. does anyone know what the problem could be?
Re: 4L80E will not shift out of first gear david 10-12-11  
Since the fluid you replaced was already dark that is usually a sign that the trans is starting to wear i have always gone by the color or mileage on the trans if its over 100,000 or the fluid is discolored it has never been done it recomended to not replace it cause all the new tranny fluid has cleaned out all the grit and grime that the steels and clutches where using to keep together and moving
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