1990 Buick Reatta does not upshift from first?

  • Thread starter Thread starter reatta_1990
  • Start date Start date
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reatta_1990

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Hi there, I am fairly mechanically inclined, and am going to purchase a replacement 4T60 trans tomorrow and put it in within the next week or so, but before that, The other day was driving the car, turned and when I went to accelerate after the turn, it just reved, as in a false neutral. After wards I checked all the cables, service manual, and all is good externally. I got it to go into 3rd for about 1 mile after adding some seafoam, but now it just never leaves 1st, reverse and neutral are fine. and BTW trans was rebuilt less than 9k ago.
 
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