Transmission not shifting into third or fourth gears

1998 MERCURY SABLE
12,400 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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DON EDVALDS
  • MEMBER
  • 2 POSTS
It shifts into first and second fine with the shift handle in drive, is smooth and locks in fine, yet as speed picks up it will not hit three gear or four, overdrive. Overdrive light on all time blinking. Also I had just installed a brand new torque converter, all seals, after I finished it shifted and ran perfect as it had before it started leaking, for one week. Here are the codes: p0743, p0750, p0755, and po760. That is all of them as of 7/10/18.
Jul 13, 2018 at 4:54 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good evening.

Do you have the codes set for the light? The overdrive light is an indicator of a fault. You need to have the code pulled so we can narrow the area of failure. A parts store can read these for free. Once you have them, we can continue to give you help.

Roy
Jul 13, 2018 at 5:33 PM
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DON EDVALDS
  • MEMBER
  • 2 POSTS
Roy, I have a readout of codes. I revised page one. Thank you, Don
Jul 13, 2018 at 5:47 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Okay.
Jul 13, 2018 at 5:48 PM