Is OD locked?

[jspringator]

At 60 MPH, RPM's at 1950. While going 60, if I tap my brake while holding my foot on the gas, the RPM's don't change. Gas milage is around 13. What do I need to do

[diesel65]

Starting with the 96 model year GM changed the computer program, the torque convertor does not unlock when applying the brakes.

[DennisG01]

To know if you're converter is locked: Accelerate lightly through 55 mph. At about 50 mph you will feel a "shift" and see the RPM's drop. This is not a "shift", though - it is the converter locking up.
If you are already going about 60 MPH, depress the throttle slightly (light acceleration) and take note of your RPM's. The RPM's should not "jump" up - the RPM's should go up relative to your speed. If you push the throttle enough, the converter will unlock and the RPM's will jump a few hundred RPM. Push the throttle a little more and you'll get a downshift.

[moondoggie]

Good Day!

It