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Transmission wont shift into high gear

95 Cadillac Seville SLS wont shift to high gear. Shift solenoids have been replaced. Hovers around 3.5 - 4k rpms at 60 mph

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  • Cadillac Master
  • 5,678 Answers

Could be gone.

Posted on Apr 24, 2013

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Posted on Jan 02, 2017

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SOURCE: 1993 cadillac seville

It might be the fan relay switch. When the car gets warm check to see if the fan comes on.

Posted on Sep 22, 2008

  • 916 Answers

SOURCE: Hello, I own a 93

The transmission is controlled by the Transmission Control Unit (TCU).

Throttle position, rpm, and speed are input parameters to the TCU. The TCU has a default set of shift patterns. These shift patterns change over time based on your specific vehicle setup and driving habbits.

The shift patterns are only slightly affected by driving habbits over many driving cycles. But, changing the relationship between the throttle position and the actual speed being reported by the speed sensor can have an immediate effect on shift patterns.

While your speedo may now be correct, the realtionship between rpm and thottle position has not been corrected. That would take a gear change in the differentials.

The TCU can be reset to an inital learn base line. When this is done, the TCU will instantly learn the dynamics of your setup.

Any shop with an advanced ODB scan tool can reset the the TCU. The dealer or a transmission shop would be preferable.

You really should change your differential gears as opposed to resetting the TCU

This information was posted by ftgiles here

Posted on Jan 06, 2009

  • 51 Answers

SOURCE: Where is the shift selinod located at. how hard

remove the transmission pan they are bolted to the valve body inside the pan.

Posted on Mar 16, 2009

  • 6 Answers

SOURCE: gears slipping

Either try changing your timming chain or it could be crank censor.

Posted on May 19, 2009

  • 173 Answers

SOURCE: My 1995 cadillac seville sts wont shift out of 3rd

could be shift solenoids . on ebay for $50. are located in the bottom of transmission. remove pan and u should see the valve body it has about 20 screwes in it unbolt it it is a 10mm socket u will need. take it out and unbolt the back side of throttle body be carfull to remember where the little berings . now use a screw driver to pull the clipps holding the shift solinoids in place and reinstall

Posted on Mar 21, 2010

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1 Answer

My 1995 cadillac seville sts wont shift out of 3rd gear. when i get to about 60-65mph my rpm are at 3-4 thousand.


could be shift solenoids . on ebay for $50. are located in the bottom of transmission. remove pan and u should see the valve body it has about 20 screwes in it unbolt it it is a 10mm socket u will need. take it out and unbolt the back side of throttle body be carfull to remember where the little berings . now use a screw driver to pull the clipps holding the shift solinoids in place and reinstall

Mar 08, 2010 | 1995 Cadillac Seville

4 Answers

Where is the shift selinod located at. how hard


remove the transmission pan they are bolted to the valve body inside the pan.

Mar 16, 2009 | 1995 Cadillac Seville

1 Answer

1993 cadillac seville


It might be the fan relay switch. When the car gets warm check to see if the fan comes on.

Sep 13, 2008 | 1990 Cadillac SeVille

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