Probably the speed sensor on the transmission. It would cause both problems. You should also have a check engine light with a trouble code for the sensor.
SOURCE: won't shift out of low,speedometer doesn't work
see my comments, not 100% sure that it was the out put speed censor or not, but after reconnecting the wires to a new censor and reconnecting the battery and clearing codes it worked. connection was not clipped may have been loose
SOURCE: 1995 ford taurus no speedometer, abs light, won't shift correctly
speed sensor needs replaced
SOURCE: Chevy Corsica 1995 gearshifting speed problem
ur computer probably wont show anything ur tranny problem can be anything fron needing a filter changed to vacuum problem to torque converter check the fluid for level if low fill up- before filling look and smell fluid it should be reddish in color not brownish [fluid burnt]if it smells burnt- need trans service can be just a filter and flush ,bad sensor-actuator or rebuild
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SOURCE: overdrive button on 1995 toyota camry does not
the o/d flashes when the transm have throuble, 1st. replace speed sensor on transm. case and drive to test
SOURCE: I have a 1995 Chevy
check the wiring on top of the transmission. there is an electrical plug for the speed sensor, if it is loose, the veh will not shift correctly. get someone to remove it, reset the wires in the plug and clean the female end of the plug on the transmission. I have the same problem. It jumps from first to 3rd then back and forth then finally stays in 3rd. I pushed the wires in to set them in deeper on the plug and it seems to help.
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