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Originally Posted by 2000CAYukon
To be sure that it is really not shifting into OD, drive the truck at freeway speed and shift from OD to D. If the RPMs remain the same, it is not shifting into OD.
Pretty sure you have a 4L60E in a 93. Also remember that the TCC will still lockup in both D and OD. When this happens the RPMs will drop 200 or 300 RPM.
Report back your findings.
//2000CAYukon
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I don't believe that your statement of lock up in 3rd[D] is correct...when towing it is written always use 3rd not over drive [big D],,,as this will not engage the torque converter...
when the vehicle is above 45 mph at speed the torque converter should engage when shift selector is in overdrive which will result in a drop of about 200 rpm....when braking or accelerating the torque converter should drop out...
most likely this vehicle has lost the TCC ---torque converter engagement