The overdrive never works at normal driving. the only way it will work is like when im on the freeway and driving about 65 miles per hour, my rpm's is at about 3000 to 3500. until i release the gas pedal to allow the engine to lower the rpms. ruffly about 1000 to 1500 rpms i lightly touch the gas pedal and it goes into overdrive and it works until i come to a complete stop and i got to do it all over again. someone told me its a soliniod in the transmission. what do you think?
Check for a transmission speed sensor fault (OBDII scan). Loss of speed sensor signal will result in no torque converter lock up, and no overdrive. Also transmission filter should have been changed at 80,000 miles. Age of your vehicle(1994) warrants the filter service. Transfer case (4WD) needs to be serviced as well.
SOURCE: dodge ram 1500 engine rpms surge at freeway speed
those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: my 1996 taurus will not shift into overdrive even
The overdrive circuit is is faulty and will have to be replaced or short in the wiring .
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